Long-term Debt (Tables) |
12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Dec. 31, 2015 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Estimated Fair Values of Outstanding Warrants Using Black-Scholes Option-Pricing Model | The fair value of the outstanding Hercules warrants as of the IPO closing date was $0.8 million and was determined using the Black-Scholes option-pricing model with the following assumptions:
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| Series C Warrants [Member] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Summary of Estimated Fair Values of Outstanding Warrants Using Black-Scholes Option-Pricing Model | The estimated fair value of the outstanding Series C warrants at the IPO closing date and December 31, 2013 was $2.3 million and $0.4 million, respectively. The estimated fair values were determined using the Black-Scholes option-pricing model with the following assumptions:
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