Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Apr. 20, 2016	Feb. 17, 2016
Class Of Stock [Line Items]
Common stock, capital shares reserved for future issuance	17,451,370
Prior to the Approval of 2016 LTIP and ESPP [Member]
Class Of Stock [Line Items]
Common stock, capital shares reserved for future issuance	7,451,870
2016 LTIP [Member]
Class Of Stock [Line Items]
Number of shares authorized under the plan		6,949,400	6,949,400
2006 LTIP [Member]
Class Of Stock [Line Items]
Number of shares authorized under the plan			1,949,400
ESPP [Member]
Class Of Stock [Line Items]
Number of shares authorized under the plan		5,000,000
Series A Convertible Preferred Stock [Member]
Class Of Stock [Line Items]
Preferred stock dividends issued	7,607
Dividends in arrears	$ 4