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Stock Award Plans (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Based Award Plans

The following table summarizes information about the Company’s stock-based award plans as of December 31, 2020:

		Outstanding Options				Outstanding Restricted Stock Units				Shares Available for Future Issuance
2004 Equity Incentive Plan			392,180				—				—
2013 Equity Incentive Plan			4,318,058				148,150				—
2018 Equity Incentive Plan			7,533,823				5,889,392				7,717,480
2004 Non-Employee Directors’ Stock Option Plan			20,555				—				—
Total			12,264,616				6,037,542				7,717,480

Stock Based Compensation Expense Recognized in Accompanying Consolidated Statements of Operations by Category

Total stock-based compensation expense recognized in the accompanying consolidated statements of operations is included in the following categories (in thousands):

		Year Ended December 31,
		2020				2019
Cost of goods sold		$	446			$	601
Cost of revenue — collaborations and services			626				738
Research and development			338				356
Selling, general and administrative			5,101				4,508
Total		$	6,511			$	6,203

Assumptions Used to Calculate Fair Value of Employee Stock Options

The Company calculated the fair value of employee stock options granted during the years ended December 31, 2020 and 2019 using the following assumptions:

		Year Ended December 31,
		2020				2019
Risk-free interest rate		0.39% — 1.52%				1.52% — 2.51%
Expected lives		5.67 — 7.0 years				6.20 — 9.37 years
Volatility		93.83% — 94.25%				93.05% — 94.25%
Dividends			—				—

Summary of Stock Options Outstanding

The following table summarizes information relating to stock options:

		Number of Shares				Weighted Average Exercise Price per Share				Weighted Average Remaining Contractual Term (Years)				Aggregate Intrinsic Value ($000)
Outstanding at January 1, 2020			14,135,681			$	3.09				7.84			$	182
Granted			196,400				1.30
Exercised			(432,166	)			1.40
Forfeited			(1,451,403	)			1.55
Expired			(183,896	)			9.86
Outstanding at December 31, 2020			12,264,616			$	3.41				6.45			$	15,414
Exercisable at December 31, 2020			7,493,851			$	4.56				5.62			$	8,079

Summary of Restricted Stock Unit Activity

The following table summarizes information relating to restricted stock units:

		Number of Shares				Weighted Average Grant Date Fair Value per Share
Outstanding at January 1, 2020			1,057,047			$	2.16
Granted			7,009,997				2.08
Vested			(1,731,076	)			1.81
Forfeited			(298,426	)			1.39
Outstanding at December 31, 2020			6,037,542				2.20

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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.

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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.

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