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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 31, 2018 | Jul. 31, 2018 | Feb. 28, 2018 | Jan. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of options exercised |  |  |  |  | 0 |  | 0 |
Proceeds from exercise of stock options |  |  |  |  | $ 0 |  | $ 0 |
Issuance of common stock for services (Shares) |  |  |  |  | 0 | 0 | 75,183 | 46,858
Issuance of common stock for services, amount |  |  |  |  | $ 300 | $ 200 | $ 300 | $ 200
Options to Purchase Common Stock [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized stock based compensation expense |  |  |  |  | 14,400 |  | $ 14,400 |
Unrecognized stock based compensation expense, weighted-average remaining recognition period |  |  |  |  |  |  | 2 years 9 months 18 days |
Number of options exercised |  |  |  |  |  | 4,833 |  | 33,159
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized stock based compensation expense |  |  |  |  | $ 1,200 |  | $ 1,200 |
Unrecognized stock based compensation expense, weighted-average remaining recognition period |  |  |  |  |  |  | 1 year 8 months 12 days |
Number of shares issued upon vesting of restricted stock units |  |  |  |  | 0 | 0 | 0 | 15,188
Performance-Based Restricted Stock Units (PSRUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares, Granted |  | 903,374 |  | 161,865 |  |  |  |
Number of shares, Outstanding |  | 903,374 |  | 125,895 |  |  |  |
Number of vested shares |  |  |  |  | 0 | 0 | 0 | 0
Recognized stock-based compensation related expense in connection with vesting of award granted |  |  |  |  | $ 100 |  | $ 500 |
Unrecognized stock based compensation expense |  |  |  |  | 100 |  | $ 100 |
Unrecognized stock based compensation expense, weighted-average remaining recognition period |  |  |  |  |  |  | 1 month 6 days |
Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized stock based compensation expense |  |  |  |  | $ 100 |  | $ 100 |
Unrecognized stock based compensation expense, weighted-average remaining recognition period |  |  |  |  |  |  | 4 months 24 days |
Number of shares issued under ESPP | 52,370 |  | 68,589 |  |  |  |  |
Purchase price | $ 3.66 |  | $ 4.38 |  |  |  |  |
Proceeds | $ 200 |  | $ 300 |  |  |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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