Stock-Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended									1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Warrants [Member]	Dec. 31, 2012 Warrants [Member]	Dec. 31, 2011 Warrants [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Nov. 30, 2010 Restricted Stock [Member] Chief Executive Officer [Member]	Dec. 31, 2013 Employee Stock Purchase Plan Espp [Member]	Dec. 31, 2013 Stock Option and Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock	5,296											955
Percentage of automatic increase in shares reserved and available for issuance determined based on shares outstanding												4.00%
Initial issuance of common stock											238	693
Stock-based compensation expense under share based plans	$ 6,491	$ 822	$ 863			$ 102	$ 92	$ 80	$ 82
Intrinsic value of stock options exercised	3,931	17	1
Weighted average grant date fair value of options granted	$ 7.36	$ 1.51	$ 1.48
Aggregate fair value of stock awards vested	1,548	97	116
Unrecognized compensation expense related to unvested stock options and restricted stock awards	10,517
Expected period for stock option	3 years 3 months 18 days
Warrants issued						50
Warrants outstanding period						10 years
Stock-based compensation expense						$ 102	$ 63	$ 63	$ 63
Restricted shares issued in exchange for non-recourse note										329
Note receivable, interest rate										4.00%