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Warrants (Changes in Fair Value of Warrant Liability) (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance $ 1,860 $ 14,518 $ 5,358
Fair Value of Warrants Granted 10,357 9,886 10,296
Fair Value Of Warrants Exercised 0 (324) 0
Change in fair value of warrants (3,707) (22,220) (1,136)
Warrant liability, Ending balance 8,510 1,860 14,518
February 2017      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 0    
Fair Value of Warrants Granted 10,357    
Fair Value Of Warrants Exercised 0    
Change in fair value of warrants (2,345)    
Warrant liability, Ending balance 8,012 0  
July 2016      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 753 0  
Fair Value of Warrants Granted 0 4,296  
Fair Value Of Warrants Exercised 0 0  
Change in fair value of warrants (540) (3,543)  
Warrant liability, Ending balance 213 753 0
January 2016      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 529 0  
Fair Value of Warrants Granted 0 5,590  
Fair Value Of Warrants Exercised 0 0  
Change in fair value of warrants (375) (5,061)  
Warrant liability, Ending balance 154 529 0
March 2015      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 432 10,337 0
Fair Value of Warrants Granted 0 0 10,296
Fair Value Of Warrants Exercised 0 0 0
Change in fair value of warrants (301) (9,905) 41
Warrant liability, Ending balance 131 432 10,337
September 2013      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 81 1,933 2,560
Fair Value of Warrants Granted 0 0 0
Fair Value Of Warrants Exercised 0 0 0
Change in fair value of warrants (81) (1,852) (627)
Warrant liability, Ending balance 0 81 1,933
December 2012      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 65 1,565 2,027
Fair Value of Warrants Granted 0 0 0
Fair Value Of Warrants Exercised 0 0 0
Change in fair value of warrants (65) (1,500) (462)
Warrant liability, Ending balance 0 65 1,565
April 2011      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 0 537 625
Fair Value of Warrants Granted 0 0 0
Fair Value Of Warrants Exercised 0 (278) 0
Change in fair value of warrants 0 (259) (88)
Warrant liability, Ending balance 0 0 537
March 2011      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance 0 144 144
Fair Value of Warrants Granted   0 0
Fair Value Of Warrants Exercised   (46) 0
Change in fair value of warrants   (98) 0
Warrant liability, Ending balance   0 144
March 2010      
Class of Warrant or Right, Fair Value [Roll Forward]      
Warrant liability, Beginning balance $ 0 2 2
Fair Value of Warrants Granted   0 0
Fair Value Of Warrants Exercised   0 0
Change in fair value of warrants   (2) 0
Warrant liability, Ending balance   $ 0 $ 2