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Stock-Based Compensation - Summary of Options and Awards Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Stock-based compensation |  |
Options and Awards Available for Grant, Outstanding, Beginning balance | 764,145 |
Options and Awards Available for Grant, Options authorized | 512,864 |
Options and Awards Available for Grant, RSUs granted | (165,152) |
Options Available for Grant, RSUs cancelled/forfeited | 9,000 |
Options and Awards Available for Grant, Options granted | (587,852) |
Options Available for Grant, Options exercised | 0 |
Options and Awards Available for Grant, Options cancelled/forfeited | 136,154.00 |
Options and Awards Available for Grant, Outstanding, Ending balance | 669,159 | 764,145
Number of Options, Outstanding, Beginning balance | 1,475,299 |
Number of Options, Options granted | 587,852 |
Number of Options, Options exercised | (10,278) |
Number of Options, Options cancelled/forfeited | (145,161) |
Number of Options, Outstanding, Ending balance | 1,907,712 | 1,475,299
Number of Options, exercisable | 872,161 |
Weighted - Average Exercise Price Per Share, Options outstanding, Beginning balance | $ 7.60 |
Weighted - Average Exercise Price Per Share, Options granted | 6.70 |
Weighted - Average Exercise Price Per Share, Options exercised | 4.70 |
Weighted - Average Exercise Price Per Share, Options cancelled/forfeited | 8.78 |
Weighted - Average Exercise Price Per Share, Options outstanding, Ending balance | 7.25 | $ 7.60
Weighted - Average Exercise Price Per Share, Options exercisable | $ 7.03 |
Weighted - Average Remaining Contractual Life, Options outstanding | 8 years | 7 years 9 months 18 days
Weighted - Average Remaining Contractual Life, Options exercisable | 7 years |
Aggregate Intrinsic Value, Options outstanding | $ 385 | $ 284
Aggregate Intrinsic Value, Options exercised | 24 |
Aggregate Intrinsic Value, Options exercisable | $ 385 |

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- Definition Share based compensation arrangement by share based payment award number of shares available for grant cancelled or forfeited in period other than options. + References No definition available. + 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://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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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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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- Definition Number of options outstanding, including both vested and non-vested options. + 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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