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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

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