Stockholders' Equity - Additional information (Detail)			1 Months Ended					12 Months Ended
	Jul. 02, 2015 USD ($)	Feb. 07, 2014 USD ($) $ / shares shares	Oct. 31, 2014 USD ($) shares	Sep. 30, 2014 USD ($) shares	Jan. 31, 2014 USD ($) shares	Nov. 30, 2013 USD ($)	Jul. 31, 2011 shares	Dec. 31, 2015 USD ($) Executives $ / shares shares	Dec. 31, 2014 USD ($) Executives $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Dec. 31, 2012 shares	Jul. 31, 2013 USD ($) $ / shares shares	Dec. 03, 2012 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, shares issued								52,730,799	51,603,070
Common Stock, par value | $ / shares								$ 0.001	$ 0.001
Company employees, directors and affiliates stock option exercised								235,480	1,332,563	115,667
Proceeds from common stock | $								$ 755,000	$ 4,580,000	$ 357,000
Preferred Stock, par value | $ / shares								$ 0.001	$ 0.001
Authorized shares of preferred stock								5,000,000	5,000,000
Series A Preferred stock converted									570,300	0
Vesting period of options								3 years
Number of RSUs vested								207,797
Common stock authorized beginning balance								75,000,000	75,000,000
Weighted average grant date fair value of options granted | $ / shares								$ 4.99	$ 7.18	$ 3.28
Number of options granted in period with exercise price below market price								0	0	0
Unrecognized compensation cost related to non-vested share-based compensation awards granted | $								$ 25,220,000
Unrecognized compensation cost related to non-vested share-based compensation awards granted year								4 years
Exercise price of warrants | $ / shares										$ 5.00
Warrants exercised to purchase shares of common stock									2,217,520	10,000
Warrants classified as derivative liabilities									1,999,153
Securities excluded from computation of diluted earnings per share								9,788,838	8,184,460	11,406,369
Number of executive officers from whom swing profits were recovered | Executives								1	3
Short swing profits recovered | $								$ 6,000	$ 80,000
Definitive Securities Purchase Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, shares issued		7,500,000
Proceeds from common stock | $		$ 58,200,000
Common Stock, par value | $ / shares		$ 0.001
Selling price of shares | $ / shares		$ 8.00
Offering price per share		3.10%
Employees and Directors Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company employees, directors and affiliates stock option exercised								200,000	1,300,000	100,000
Proceeds from common stock | $								$ 800,000	$ 4,600,000	$ 400,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity instruments awarded in period								2,421,911
Fair market value of RSUs granted | $								$ 33,500,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of warrants | $ / shares									$ 3.12
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price of warrants | $ / shares									$ 5.00
Mid Cap [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock												357,356
Exercise price of warrants | $ / shares												$ 4.20
Fair value of warrants | $												$ 1,000,000
LTIP [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of equity instruments awarded in period								35,000
Restricted stock units ("RSUs") issued to directors and key employees								1,078,000			978,000
Restricted stock units reserved for future officers								100,000
RSU's Vested per performance criteria during period								8 years
Number of RSUs vested								21,356	4,447	8,986
Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock options outstanding and exercisable							1,938,039
Term that options may be awarded							10 years
2011 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares of common stock authorized								2,250,000
2011 Equity Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized beginning balance								8,800,000
2011 Equity Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized beginning balance								11,050,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company's securities for shelf registration | $	$ 150,000,000					$ 75,000,000
Common Stock, shares issued			116,911	529,010	658,489
Proceeds from common stock | $			$ 1,900,000	$ 8,700,000	$ 3,900,000
Universal shelf registration amount, maximum | $	$ 40,000,000					$ 15,000,000
Company employees, directors and affiliates stock option exercised								223,923	1,332,563	115,667
Series A Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized shares of preferred stock								2,290,700
Series A Preferred shares issued								2,093,155					2,709,300
Liquidation, dissolution or winding up, holders of the Series A Preferred per share payment | $ / shares													$ 0.001
Series A Preferred stock converted								45,845	570,300