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Stock Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement, Noncash Expense [Abstract] |
Schedule of Company Recorded Stock-based Compensation Expense | The Company recorded stock-based compensation expense to the following line items in the consolidated statements of operations for the years ended December 31:
(in thousands) | 2020 |  | 2019 |  | 2018
Cost of sales - contracts | $ | 367 |  |  | $ | 234 |  |  | $ | 90 |
Selling, general and administrative | 3,884 |  |  | 2,472 |  |  | 949 |
Total stock-based compensation expense | $ | 4,251 |  |  | $ | 2,706 |  |  | $ | 1,039 |
Schedule of Information With Respect to Stock Options | The below table presents information with respect to stock options:
(in thousands, except for exercise price) | Number of Shares |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value
Outstanding at December 31, 2019 | 400 |  |  | $ | 14.50 |  |  |
Options granted | 619 |  |  | 13.82 |  |  |
Options exercised | (47) |  |  | 10.90 |  |  |
Options forfeited | (15) |  |  | 11.36 |  |  |
Outstanding at December 31, 2020 | 957 |  |  | $ | 14.29 |  |  | $ | 46,398 |
Vested and expected to vest at December 31, 2020 | 938 |  |  | $ | 14.27 |  |  |
Total shares exercisable as of December 31, 2020 | 222 |  |  | $ | 12.03 |  |  |
Shares remaining available for future grant | 601 |  |  |  |  |
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 respective period ending December 31:
| 2020 |  | 2019
Expected option life | 4.4 years |  | 3.0 years
Weighted average risk-free interest rate | 0.4 | % |  | 2.0 | %
Weighted average expected volatility | 47.6 | % |  | 35.0 | %
Expected dividend yield | None |  | None
Schedule of Share-based Compensation by Exercise Price Range | Stock options outstanding at December 31, 2020 are summarized as follows:
Range of Exercise Prices |  | Number Outstanding (in thousands) |  | Weighted Average Remaining Life |  | Weighted Average Exercise Price
$4.72 - $35.17 |  | 957 |  |  | 8.45 years |  | $ | 14.29 |
Schedule of Activity With Respect to Non-vested Stock Options | Current year activity with respect to the Company’s non-vested RSAs is as follows:
Non-vested RSAs | Shares (in thousands) |  | Weighted Average grant- date fair value
Balance at January 1, 2020 | 149 |  |  | $ | 24.62 |
Granted | 29 |  |  | 30.96 |
Vested | (112) |  |  | 26.36 |
Forfeited | (5) |  |  | 23.91 |
Balance at December 31, 2020 | 61 |  |  | $ | 25.62 |
Summary of Restricted Stock Awards Activity | Current year activity with respect to the Company’s non-vested RSUs is as follows:
Non-vested RSUs | Shares (in thousands) |  | Weighted Average grant- date fair value
Balance at January 1, 2020 | 67 |  |  | $ | 29.73 |
Granted | 383 |  |  | 13.80 |
Vested | (23) |  |  | 29.66 |
Forfeited | — |  |  | — |
Balance at December 31, 2020 | 427 |  |  | $ | 15.46 |

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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=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=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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=120381028&loc=d3e5070-113901 + 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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