Stockholders' Equity - Additional information (Detail) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 28, 2015 USD ($) Executives	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2014 shares	Dec. 31, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of options granted period			10 years
Vesting period of shares			3 years
Unrecognized compensation cost related to non-vested share-based compensation awards granted | $		$ 34,000	$ 34,000
Unrecognized compensation cost related to non-vested share-based compensation awards granted year			2018
Stock option exercisable		2,537,534	2,537,534
Options outstanding		3,322,378	3,322,378		3,196,100
Weighted average exercise price | $ / shares		$ 3.12	$ 3.12
Securities excluded from computation of diluted earnings per share			9,743,687	8,896,955
Number of executive officers from whom swing profits were recovered | Executives	1
Short swing profits recovered | $	$ 6
Fair market value of RSUs granted | $		$ 2,800	$ 32,800
Vesting period of options			3 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity instruments awarded in period		319,296	2,421,911
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding		284	284
Directors and Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity instruments awarded in period			480,818
Fair market value of shares granted | $			$ 2,800