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Stockholders' Equity - (Common Stock are Reserved for Future Issuance) (Detail) - shares shares in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Equity [Abstract] |  |  |  |
Warrants outstanding | 19,557 | 2,570 | 1,116 | 428
Stock options outstanding | 505 | 561 | 663 |
Options reserved for future issuance under the Company's 2016 Incentive Plan | 466 |  |  |
Shares reserved for future issuance under the Employee Stock Purchase Plan | 17 |  |  |
Total reserved for future issuance | 20,545 |  |  |

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- Definition Options reserved for future issuance under the Company's 2007 Incentive Plan. + 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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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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