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Stockholders' Equity and Dilutive Equity Instruments - Additional Information (Detail) - $ / shares | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Stockholders Equity Note [Line Items] |  |
Shares issuable upon exercise of warrants | 0 | 108,044
In-the-money Warrants and Restricted Stock Awards and Units |  |
Stockholders Equity Note [Line Items] |  |
Incremental "in-the-money" warrants, and restricted stock awards and units | 3,997,084 | 4,521,727
Out-of-the-money Warrants |  |
Stockholders Equity Note [Line Items] |  |
Warrants outstanding | 5,923,399 | 5,062,089
Out-of-the-money Warrants | Series A Warrants |  |
Stockholders Equity Note [Line Items] |  |
Warrants exercise prices | $ 57.06 | $ 57.06
Out-of-the-money Warrants | Series B Warrants |  |
Stockholders Equity Note [Line Items] |  |
Warrants exercise prices | 62.28 | 62.28
Out-of-the-money Warrants | GLF Equity Warrants |  |
Stockholders Equity Note [Line Items] |  |
Warrants exercise prices | $ 100 | $ 100

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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