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Stock-Based Compensation Expense (Tables) | 3 Months Ended
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Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
​ |  | 2020 |  | 2019
Cost of sales | ​ | $ | 339 | ​ | $ | 252
Research and development | ​ |  | 285 | ​ |  | 192
Selling, general and administrative | ​ |  | 2,153 | ​ |  | 1,322
Stock-based compensation expense before taxes | ​ | $ | 2,777 | ​ | $ | 1,766
Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended |
​ | ​ | March 31, | ​
​ | ​ | 2020 | ​ | 2019 |
Risk-free interest rate |  | 0.52% - 1.67% |  | 2.42% - 2.56% | ​
Expected option term |  | 4.0 - 5.0 years |  | 3.0 - 5.0 years | ​
Expected dividend yield |  | — |  | — | ​
Expected price volatility |  | 38.65% - 43.24% |  | 28.93% - 33.69% | ​
Stock-Settled Performance-Based Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | ​
​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | March 31,
​ | ​ | 2020
Risk-free interest rate |  | 1.1% - 1.3%
Performance period |  | 0.8 - 2.8 years
Expected dividend yield |  | —
Expected price volatility |  | 40.2% - 56.1%

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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