Restricted Cash - Additional Information (Detail) - USD ($) $ in Thousands |
1 Months Ended | 12 Months Ended |
|---|---|---|
Oct. 31, 2014 |
Dec. 31, 2015 |
|
| Cash And Cash Equivalents [Line Items] | ||
| Restricted cash refunded by FCC | $ 1,000 | |
| Restricted cash - current | $ 1,000 | |
| Restricted Cash [Member] | ||
| Cash And Cash Equivalents [Line Items] | ||
| Amount of cash collateral to be reduced upon completion of specified milestones | 1,000 | |
| Restricted cash - current | $ 1,000 |