Common Stock - Additional Information (Detail) $ / shares in Units, $ in Thousands		12 Months Ended
	Apr. 02, 2014 USD ($)	Dec. 31, 2016 USD ($) vote_per_share $ / shares shares	Dec. 31, 2015 $ / shares shares	Dec. 31, 2014 USD ($) shares	Apr. 01, 2014 $ / shares
Class of Stock [Line Items]
Common stock, shares authorized (in shares)		225,000,000	225,000,000
Holder of each share of common stock entitled vote | vote_per_share		1
Issuance of common stock		3,171,000,000		5,750,000
Common stock, par value (usd per share) | $ / shares		$ 0.001	$ 0.001		$ 0.001
Stock price (in dollars per share) | $ / shares					$ 11.00
Issuance of common stock | $	$ 59,200	$ 4,775		$ 59,209
Convertible Senior Subordinated Notes | Early Conversion Payment
Class of Stock [Line Items]
Number of common shares issued upon early conversion of notes (in shares)		9,022,954	0	2,743,475