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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Stock Based Compensation Expenses Included on Operations Statement

The following table presents all stock-based compensation as included on the combined consolidated statements of operations (in thousands):

		For the Year Ended December 31,
		2020				2019
Stock-based compensation expense:
Employee stock options			1,426				2,053
Employee and Non-employee RSUs			761				1,368
		$	2,187			$	3,421
Stock-based compensation expense in operating expenses:
Research and development		$	261			$	1,288
Selling, general and administrative			1,926				2,133
		$	2,187			$	3,421

Summarizes Stock Option Activity and Related Information Under Equity Incentive Plans

The following table summarizes stock option activity and related information under all equity incentive plans for the years ended December 31, 2020 and 2019:

		Number of Shares				Weighted- Average Exercise Price				Aggregate Intrinsic Value (in thousands)				Weighted- Average Remaining Contractual Life (in years)
Outstanding as of December 31, 2018			8,363,045			$	6.54			$	11,998				3.9
Options exercised			(1,993,688	)		$	2.06
Options forfeited			(41,341	)		$	7.64
Options expired			(247,533	)		$	1.60
Outstanding as of December 31, 2019			6,080,483			$	8.24			$	14,458				5.3
Options granted			400,000			$	6.21
Options exercised			(1,272,273	)		$	1.89
Options forfeited			(211,926	)		$	2.23
Outstanding as of December 31, 2020			4,996,284			$	9.96			$	29,746				4.7
Vested and Exercisable as of December 31, 2020			4,345,497			$	10.70			$	24,333				4.1

Summary of Options Outstanding and Vested

The following table provides a summary of options outstanding and vested as of December 31, 2020:

Exercise Prices		Number Outstanding				Weighted- Average Remaining Contractual Life (in years)				Number Exercisable				Weighted- Average Remaining Contractual Life (in years)
$0.4213			512,036				3.9				512,036				3.9
$0.78			49,549				2.6				49,549				2.6
$1.7554			288,404				4.0				288,404				4.0
$1.9984			262,120				4.1				262,120				4.1
$2.18			1,842				5.5				1,842				5.5
$2.87			982				5.7				880				6.4
$3.07			600,000				7.7				349,998				7.7
$3.4-$3.98			1,163,543				3.0				1,163,543				3.0
$4.54			255,806				0.3				255,806				0.3
$6.21			400,000				9.4				—				—
$8.19			6,552				5.7				5,869				5.7
$25.00			1,455,450				4.6				1,455,450				4.6
			4,996,284				4.7				4,345,497				4.1

Weighted Average of Fair Value of Options Under Black-Scholes Option-Pricing Model

We may grant stock options to both employees and directors of the company and to employees of related parties that provide shared services to the company under our shared services agreement with NantWorks, as discussed in Note 9, Related Party Agreements. The fair value of each stock option issued was estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:

		For the Year Ended December 31,
		2020				2019
Expected term (in years)			5.5				N/A
Risk-free interest rate			0.4	%			N/A
Expected volatility			96.8	%			N/A
Dividend yield			0.0	%			N/A
Weighted-average grant date fair value		$	4.64				N/A

Restricted Stock Units (RSUs) Activity

The following table summarizes the restricted stock units, or RSUs, activity under the 2015 Plan:

		Number of RSUs Outstanding				Weighted- Average Grant Date Fair Value
Unvested balance as of December 31, 2018			875,589			$	6.70
Granted			749,793			$	1.12
Vested			(401,193	)		$	8.82
Forfeited/canceled			(83,225	)		$	7.29
Unvested balance as of December 31, 2019			1,140,964			$	2.24
Granted			33,500			$	6.43
Vested			(649,872	)		$	2.05
Forfeited/canceled			(57,750	)		$	4.47
Unvested balance as of December 31, 2020			466,842			$	2.52

Summary of Warrant Activity

The following table summarizes our warrant activity:

Outstanding as of December 31, 2018			21,302,049
Warrants exercised			(19,664,049	)
Outstanding as of December 31, 2019			1,638,000
Warrants exercised			—
Outstanding as of December 31, 2020			1,638,000

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