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Stock-based Compensation - Additional Disclosures (Details) (USD $)
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3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 9 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
Stock Options [Member]
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Sep. 30, 2014
Restricted Stock Units (RSUs) [Member]
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Sep. 30, 2014
Former Chief Executive Officer [Member]
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Sep. 30, 2014
Former Chief Executive Officer [Member]
Stock Options [Member]
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Aug. 04, 2014
Employees, Excluding Directors and Officers [Member]
employee
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Aug. 04, 2014
Employees, Excluding Directors and Officers [Member]
Stock Options [Member]
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Aug. 04, 2014
CEO [Member]
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Aug. 04, 2014
Minimum [Member]
Employees, Excluding Directors and Officers [Member]
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Sep. 30, 2014
Option Modification [Member]
Employees, Excluding Directors and Officers [Member]
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Sep. 30, 2014
Option Modification [Member]
Employees, Excluding Directors and Officers [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||
| Stock-based compensation expense | $ 1,226,000 | $ 683,000 | $ 2,754,000 | $ 1,862,000 | $ 300,000 | $ 300,000 | |||||||||||
| Tax deduction allowed for incentive stock options | 0 | ||||||||||||||||
| Deferred income tax asset for the expense related to options | 0 | 0 | |||||||||||||||
| Closing stock price as reported on the NASDAQ | $ 1.91 | $ 1.91 | |||||||||||||||
| Total intrinsic value of options exercised | 500,000 | ||||||||||||||||
| Weighted average fair value of options issued (in dollars per share) | $ 1.32 | ||||||||||||||||
| Unrecognized compensation cost related to non-vested options granted | 6,800,000 | 6,800,000 | |||||||||||||||
| Unrecognized compensation cost related to RSUs | 2,100,000 | ||||||||||||||||
| Expected weighted-average period to recognize unrecognized compensation cost | 2 years 11 months 5 days | 2 years 11 months | |||||||||||||||
| Total fair value of shares vested | 1,300,000 | ||||||||||||||||
| Number of shares modified | 752,725 | 1,547,382 | |||||||||||||||
| Contractual term | 10 years | ||||||||||||||||
| Incremental compensation expense from plan modification | $ 200,000 | $ 600,000 | |||||||||||||||
| Option modification, minimum exercise price required for modification (in dollars per share) | $ 3.00 | ||||||||||||||||
| Number of employees affected by plan modification | 203 | ||||||||||||||||
| Reset exercise price (in dollars per share) | $ 2.38 | ||||||||||||||||
| Number of stock options granted | 4,972,895 | [1] | 2,001,338 | ||||||||||||||
| Options granted, exercise price (in dollars per share) | $ 2.56 | [1] | $ 2.38 | ||||||||||||||
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