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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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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