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Stock-Based Compensation - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2018 | Jan. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Share-based Compensation |  |  |  |  |  |  |
Shares available for future issuance (in shares) |  |  | 826,988 |  | 826,988 |  | 83,929
Number of stock options granted (in shares) |  |  |  |  | 310,715 |  |
Options remained outstanding |  |  | 1,696,187 |  | 1,696,187 |  | 1,593,195
Total grant date fair value of options vested |  |  | $ 545,000 | $ 797,000 | $ 922,000 | $ 904,000 |
Unrecognized compensation expense, weighted-average period expected to be recognized |  |  |  |  | 2 years 10 months 24 days |  |
Weighted-average exercise price (per share) | $ 7.64 | $ 16.25 | $ 7.28 |  | $ 7.28 |  | $ 8.88
Stock-based compensation expense |  |  | $ 717,000 | $ 408,000 | $ 1,342,000 | $ 839,000 |
Immediate vesting |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Incremental modification value | $ 63,000 |  |  |  |  |  |
Remaining vesting |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Incremental modification value | $ 537,000 |  |  |  |  |  |
Chief Executive Officer |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Number of vested and unvested stock option award modified | 400,000 |  |  |  |  |  |
Incremental modification value | $ 600,000 |  |  |  |  |  |
Employees |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Weighted-average grant date fair value of options granted |  |  | $ 4.14 | $ 5.25 | $ 4.56 | $ 4.67 |
Stock-based compensation expense |  |  | $ 688,000,000 | $ 319,000,000 | $ 1,300,000 | $ 740,000 |
Non-Employee |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Number of stock options granted (in shares) |  |  | 0 | 0 | 7,200 | 0 |
Options remained outstanding |  |  | 45,072 |  | 45,072 |  |
Weighted-average exercise price (per share) |  |  | $ 9.15 |  | $ 9.15 |  |
Stock-based compensation expense |  |  | $ 29,000 | $ 89,000 | $ 44,000 | $ 99,000 |
2016 Employee Stock Purchase Plan |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |
Increase in number of shares available for grant |  | 128,172 |  |  |  |  |
Shares available for future issuance (in shares) |  |  | 291,659 |  | 291,659 |  |
Number of shares issued (in shares) |  |  | 20,057 | 17,924 | 20,057 | 17,924 |
Value of share issued |  |  | $ 137,000 |  | $ 137,000 | $ 122,000 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(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 The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + 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) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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