Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($) |
Dec. 31, 2015 |
Dec. 31, 2014 |
Jun. 12, 2014 |
|---|---|---|---|
| Compensating Balances [Line Items] | |||
| Restricted cash, short-term | $ 1,861,000 | $ 0 | |
| Amended New Loan and Security Agreement | |||
| Compensating Balances [Line Items] | |||
| Restricted cash, short-term | 1,900,000 | ||
| Available borrowing capacity | 3,100,000 | ||
| Amended New Loan and Security Agreement | Minimum | |||
| Compensating Balances [Line Items] | |||
| Minimum amount required to be maintained by the company at all times | $ 5,000,000 | $ 5,000,000 |