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Stock Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Share-based Payment Arrangement [Abstract] |
Share-based Payment Arrangement, Expensed and Capitalized, Amount | Stock-based compensation expense, net of forfeitures of $64.0 thousand and $27.0 thousand for the three months ended June 30, 2021 and 2020, respectively, and stock-based compensation expense, net of forfeitures of $107.0 thousand and $32.0 thousand for six months ended June 30, 2021 and 2020, respectively, was recorded in the following line items in the condensed consolidated statements of operations for the three and six months ended June 30:
| Three months ended June 30, |  | Six months ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Cost of sales - contracts | $ | 116 |  |  | $ | 101 |  |  | $ | 184 |  |  | $ | 199 |
Selling, general and administrative | 4,135 |  |  | 1,022 |  |  | 5,387 |  |  | 2,013 |
Total stock-based compensation expense | $ | 4,251 |  |  | $ | 1,123 |  |  | $ | 5,571 |  |  | $ | 2,212 |
Summary of Stock Option Activity | A summary of stock option activity for the six months ended June 30, 2021 is below:
(in thousands, except for exercise price) | Options outstanding |  | Weighted average exercise price
Outstanding at January 1, 2021 | 957 |  |  | $ | 14.29 |
Granted | 563 |  |  | 7.79 |
Exercised | (54) |  |  | 10.70 |
Canceled/forfeited | (63) |  |  | 13.64 |
Outstanding at June 30, 2021 | 1,403 |  |  | $ | 11.83 |
Schedule of Assumptions for Fair Value of Options at the Date of the Grant | The fair value of options at the date of the grant was estimated using the Black-Scholes model with the following assumptions for the six months ended June 30, 2021:
Weighted average expected term | 3.1 years
Weighted average risk-free interest rate | 0.4 | %
Weighted average expected volatility | 56.5 | %
Expected dividend yield | None
Estimated fair value (per share) | $ | 60.47
Summary of Restricted Stock and RSU Awards Activity | A summary of unvested restricted stock activity for the six months ended June 30, 2021 is below:
(in thousands, except for award value) | Restricted Stock Awards |  | Weighted average award value
Outstanding at January 1, 2021 | 61 |  |  | $ | 25.62 |
Granted | 2 |  |  | 22.36 |
Vested | (34) |  |  | 24.81 |
Canceled/forfeited | (1) |  |  | 20.94 |
Outstanding at June 30, 2021 | 28 |  |  | $ | 26.51 |
A summary of unvested restricted stock units (“RSU”) activity for the six months ended June 30, 2021 is below:
(in thousands, except for award value) | RSU Awards |  | Weighted average award value
Outstanding at January 1, 2021 | 427 |  |  | $ | 15.46 |
Granted | 149 |  |  | 67.24 |
Vested | (115) |  |  | 17.08 |
Canceled/forfeited | (4) |  |  | 66.82 |
Outstanding at June 30, 2021 | 457 |  |  | $ | 31.39 |

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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=120381028&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=122041274&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=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&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 (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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=120381028&loc=d3e5070-113901 + Details
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