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Stock-Based Compensation - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 31, 2019 | Feb. 28, 2018 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Jan. 31, 2018
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Total grant date fair value of options vested |  |  | $ 557,000 |  |  | $ 510,000 |  |  | $ 1,800,000 | $ 1,400,000 |  |
Shares available for future issuance (in shares) |  |  | 669,159 |  |  |  |  |  | 669,159 |  | 764,145 |
Value of share issued |  |  | $ 28,000 | $ 137,000 | $ 13,000 | 1,332,000 | $ 723,000 | $ 309,000 |  |  |  |
Weighted-average exercise price (per share) |  |  | $ 7.25 |  |  |  |  |  | $ 7.25 |  | $ 7.60 |
Number of stock options granted (in shares) |  |  |  |  |  |  |  |  | 587,852 |  |  |
Options remained outstanding |  |  | 1,907,712 |  |  |  |  |  | 1,907,712 |  | 1,475,299 |
Stock-based compensation expense |  |  | $ 895,000 |  |  | $ 722,000 |  |  | $ 2,397,000 | $ 2,064,000 |  |
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 |  |  |  |  |  |  |  |  |  |
Weighted-average exercise price (per share) |  | $ 7.64 |  |  |  |  |  |  |  |  |  | $ 16.25
Incremental modification value |  | $ 600,000 |  |  |  |  |  |  |  |  |  |
Employees |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average grant date fair value of options granted |  |  | $ 4.49 |  |  | $ 4.48 |  |  | $ 4.11 | $ 4.56 |  |
2016 Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |
Increase in number of shares available for grant | 170,955 |  |  |  |  |  |  |  |  |  |  |
Shares available for future issuance (in shares) |  |  | 417,939 |  |  |  |  |  | 417,939 |  |  |
Value of share issued |  |  |  |  |  |  |  |  | $ 130,000 | $ 137,000 |  |
Number of shares issued (in shares) |  |  |  |  |  |  |  |  | 22,405 | 20,057 |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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