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Warrants (Schedule of Warrant Activity) (Detail) - shares
shares in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Warrant or Right [Line Items]      
Warrants outstanding , Beginning balance 2,570 1,116 428
Granted 17,000 1,482 700
Exercised 0 (19) 0
Class of Warrant or Right, Expired (13) (9) (12)
Warrants outstanding , Ending balance 19,557 2,570 1,116
February 2017      
Class of Warrant or Right [Line Items]      
Warrants outstanding , Beginning balance 0    
Granted 17,000    
Exercised 0    
Class of Warrant or Right, Expired 0    
Warrants outstanding , Ending balance 17,000 0  
July 2016      
Class of Warrant or Right [Line Items]      
Warrants outstanding , Beginning balance 700 0  
Granted 0 700  
Exercised 0 0  
Class of Warrant or Right, Expired 0 0  
Warrants outstanding , Ending balance 700 700 0
January 2016      
Class of Warrant or Right [Line Items]      
Warrants outstanding , Beginning balance 682 0  
Granted 0 682  
Exercised 0 0  
Class of Warrant or Right, Expired 0 0  
Warrants outstanding , Ending balance 682 682 0
March 2015      
Class of Warrant or Right [Line Items]      
Warrants outstanding , Beginning balance 700 700 0
Granted 0 0 700
Exercised 0 0 0
Class of Warrant or Right, Expired 0 0 0
Warrants outstanding , Ending balance 700 700 700
September 2013      
Class of Warrant or Right [Line Items]      
Warrants outstanding , Beginning balance 199 199 199
Granted 0 0 0
Exercised 0 0 0
Class of Warrant or Right, Expired 0 0 0
Warrants outstanding , Ending balance 199 199 199
December 2012      
Class of Warrant or Right [Line Items]      
Warrants outstanding , Beginning balance 152 152 152
Granted 0 0 0
Exercised 0 0 0
Class of Warrant or Right, Expired 0 0 0
Warrants outstanding , Ending balance 152 152 152
April 2011      
Class of Warrant or Right [Line Items]      
Warrants outstanding , Beginning balance 13 31 31
Granted 0 0 0
Exercised 0 (18) 0
Class of Warrant or Right, Expired (13) 0 0
Warrants outstanding , Ending balance 0 13 31
Other      
Class of Warrant or Right [Line Items]      
Warrants outstanding , Beginning balance 124 24 36
Granted 0 100 0
Exercised 0 0 0
Class of Warrant or Right, Expired 0 0 (12)
Warrants outstanding , Ending balance 124 124 24
March 2011      
Class of Warrant or Right [Line Items]      
Warrants outstanding , Beginning balance 0 9 9
Granted   0 0
Exercised   (1) 0
Class of Warrant or Right, Expired   (8) 0
Warrants outstanding , Ending balance   0 9
March 2010      
Class of Warrant or Right [Line Items]      
Warrants outstanding , Beginning balance 0 1 1
Granted   0 0
Exercised   0 0
Class of Warrant or Right, Expired   (1) 0
Warrants outstanding , Ending balance   0 1