Annual report pursuant to Section 13 and 15(d)

Fair Value of Warrants - Summary of Derivative Warrant Activity (Detail)

v3.3.1.900
Fair Value of Warrants - Summary of Derivative Warrant Activity (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 10, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Warrants Outstanding [Roll Forward]        
Beginning balance   $ 52 $ 594 $ 12,549
Fair value of warrants issued       268
Fair value of warrants exercised     (125) (420)
Reclassification to equity in IPO $ (7,200) 0 0 (7,170)
Change in fair value of warrants   (35) (417) (4,633)
Ending balance   17 52 594
Debt Guarantee        
Class of Warrants Outstanding [Roll Forward]        
Beginning balance   0 64 5,679
Fair value of warrants issued       0
Fair value of warrants exercised     (87) 0
Reclassification to equity in IPO       (2,514)
Change in fair value of warrants   0 23 (3,101)
Ending balance   0 0 64
Consulting        
Class of Warrants Outstanding [Roll Forward]        
Beginning balance   0 1 147
Fair value of warrants issued       0
Fair value of warrants exercised     0 0
Reclassification to equity in IPO       (108)
Change in fair value of warrants   0 (1) (38)
Ending balance   0 0 1
Financing        
Class of Warrants Outstanding [Roll Forward]        
Beginning balance   44 412 6,493
Fair value of warrants issued       268
Fair value of warrants exercised     0 0
Reclassification to equity in IPO       (4,548)
Change in fair value of warrants   (27) (368) (1,801)
Ending balance   17 44 412
Series B Preferred Stock        
Class of Warrants Outstanding [Roll Forward]        
Beginning balance   8 117 230
Fair value of warrants issued       0
Fair value of warrants exercised     (38) (420)
Reclassification to equity in IPO       0
Change in fair value of warrants   (8) (71) 307
Ending balance   $ 0 $ 8 $ 117