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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 | Feb. 28, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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) |  |  | 75,183 | 46,858 | 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 |  |  | 14,500 |  | $ 14,500 |
Unrecognized stock based compensation expense, weighted-average remaining recognition period |  |  |  |  | 2 years 8 months 12 days |
Number of options exercised |  |  |  | 9,025 |  | 28,326
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized stock based compensation expense |  |  | $ 1,600 |  | $ 1,600 |
Unrecognized stock based compensation expense, weighted-average remaining recognition period |  |  |  |  | 1 year |
Number of shares issued upon vesting of restricted stock units |  |  | 0 | 0 | 0 | 15,188
Performance-Based Restricted Stock Units (PRSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of vested shares |  |  | 0 | 0 | 0 | 0
Recognized stock-based compensation related expense in connection with vesting of award granted |  |  | $ 300 |  | $ 400 |
Unrecognized stock based compensation expense |  |  | 300 |  | $ 300 |
Unrecognized stock based compensation expense, weighted-average remaining recognition period |  |  |  |  | 3 months 18 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 |  |  |  |  | 2 months 12 days |
Number of shares issued under ESPP | 68,589 | 42,845 |  |  |  |
Purchase price | $ 4.38 | $ 8.77 |  |  |  |
Proceeds | $ 300 | $ 400 |  |  |  |

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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 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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