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Stock Based Awards and Per Share Information - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 1 Months Ended | 1 Months Ended | 1 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Mar. 31, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Apr. 26, 2013
Sun Dental Warrant
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Apr. 26, 2013
Sun Dental Warrant
Maximum
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Apr. 18, 2013
IR Warrant 2
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Apr. 18, 2013
IR Warrant 2
Maximum
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Apr. 18, 2013
IR Warrant 2
Minimum
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Mar. 23, 2013
CMR Warrant
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Mar. 23, 2013
CMR Warrant
Maximum
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Jun. 30, 2013
2002 Stock Incentive Plan
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Mar. 23, 2013
First Tranche
CMR Warrant
Maximum
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Mar. 23, 2013
First Tranche
CMR Warrant
Minimum
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Mar. 23, 2013
Second Tranche
CMR Warrant
Maximum
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Mar. 23, 2013
Second Tranche
CMR Warrant
Minimum
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Jun. 30, 2013
President and COO
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| Stock Based Compensation Activity [Line Items] | |||||||||||||||||||
| Plan expiration date | Apr. 24, 2014 | Apr. 17, 2018 | Mar. 22, 2018 | May 05, 2019 | Jun. 05, 2020 | ||||||||||||||
| Common stock authorized for issuance under the 2002 Plan | 7,750,000 | ||||||||||||||||||
| Common stock issued pursuant to options exercised | 2,836,000 | ||||||||||||||||||
| Options outstanding | 4,322,000 | 4,322,000 | 3,860,000 | 4,322,000 | |||||||||||||||
| Options available for future grant | 592,000 | ||||||||||||||||||
| Compensation cost related to stock options | $ 380,000 | $ 340,000 | $ 748,000 | $ 923,000 | |||||||||||||||
| Net impact of share based compensation expense to earnings per basic share | $ (0.01) | $ (0.01) | $ (0.02) | $ (0.03) | |||||||||||||||
| Net impact of share based compensation expense to earnings per diluted share | $ (0.01) | $ (0.01) | $ (0.02) | $ (0.03) | |||||||||||||||
| Total unrecognized compensation cost | 2,800,000 | 2,800,000 | |||||||||||||||||
| Unrecognized share based compensation cost to be recognized over weighted-average period | 1 year 6 months | ||||||||||||||||||
| Warrants issued to purchase common stock | 500,000 | 60,000 | 100,000 | 50,000 | 50,000 | ||||||||||||||
| Warrants price of warrants | 5.90 | 5.10 | 4.50 | ||||||||||||||||
| Warrant vesting rate | 1,000 | ||||||||||||||||||
| Minimum required closing price of common stock on the NASDAQ in order to exercise | $ 7.50 | $ 7.50 | $ 10.00 | ||||||||||||||||
| Stock-based compensation | $ 748,000 | $ 923,000 | $ 1,000 | ||||||||||||||||
| Outstanding stock options and warrants excluded from diluted loss per share | 5,046,000 | 4,637,000 | 5,046,000 | 4,637,000 | |||||||||||||||
| Special stock dividends intended for the year ended 12/31/2013 | 2.00% | ||||||||||||||||||
| Dividends declared, date of record | Mar. 15, 2013 | Jun. 14, 2013 | |||||||||||||||||
| Special stock dividends declared | 0.50% | 0.50% | |||||||||||||||||
| Options granted | 1,157,000 | 350,000 | |||||||||||||||||
| Options granted exercise price per share | $ 4.00 | $ 4.00 | |||||||||||||||||
| Options granted to President and COO, vesting period | 4 years | ||||||||||||||||||