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Stockholder's Equity | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Stockholder's Equity | 9. Stockholders’ Equity Equity Incentive Plans Stock Options Activity of stock options under the 2005 Plan, 2011 Plan and 2014 Plan (collectively, the "Plans") is set forth below:
|  | Number of Shares |  | Weighted-Average Exercise Price
Balance at December 31, 2020 |  | 1,020,978 |  |  | $ | 23.38 |
Exercised |  | (42,408) |  |  | 15.70 |
Canceled/Forfeited |  | — |  |  | — |
Balance at March 31, 2021 |  | 978,570 |  |  | 23.71 |
Restricted Stock and Restricted Stock Units Activity of unvested restricted stock awards and restricted stock units under the Plans during the three months ended March 31, 2021 is set forth below:
|  | Number of Shares |  | Weighted -Average Grant Date Fair Value
Unvested at December 31, 2020 |  | 369,629 |  |  | $ | 163.03 |
Granted |  | 53,080 |  |  | 255.00 |
Released/Vested - Restricted Stock/RSUs |  | (36,672) |  |  | 140.42 |
Canceled/Forfeited |  | (4,182) |  |  | 175.99 |
Unvested at March 31, 2021 |  | 381,855 |  |  | 177.84 |
As of March 31, 2021, 364,777 restricted stock awards and restricted stock units are expected to vest. Stock-based Compensation The following table sets forth the stock-based compensation expense included in the Company’s condensed consolidated statements of operations for the three months ended March 31, 2021 and 2020 (in thousands):
|  | Three Months Ended March 31, |  |
|  | 2021 |  | 2020 |  |  |  |
Cost of revenue |  | $ | 798 |  |  | $ | 648 |  |  |  |  |
Research and development |  | 1,062 |  |  | 874 |  |  |  |  |
Sales, general and administrative |  | 4,535 |  |  | 4,167 |  |  |  |  |
Total |  | $ | 6,395 |  |  | $ | 5,689 |  |  |  |  |
As of March 31, 2021, total unrecognized compensation cost was $55.6 million related to unvested share-based compensation arrangements which is expected to be recognized over a weighted average period of 2.9 years. The total stock-based compensation cost capitalized in inventory was $1.3 million and $1.2 million as of March 31, 2021 and December 31, 2020, respectively.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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