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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Reconciliation of liabilities measured at fair value using significant unobservable inputs

The following table provides a reconciliation of liabilities measured at fair value using significant unobservable inputs (Level 3) for the year ended December 31, 2018 and 2019 (in thousands):

	Level 3 Liabilities
Balance at December 31, 2017	$	—
Contingent consideration liability recorded upon acquisition of SafeOp		3,200
Settlement of milestone #1		(1,446	)
Change in fair value measurement		846
Balance at December 31, 2018		2,600
Settlement of milestone #2		(2,889	)
Change in fair value measurement- milestone #2		289
Straight line recognition of liability classified equity award		173
Change in fair value measurement- equity award		93
Balance at December 31, 2019	$	266

Summary of weighted average assumptions used to compute stock-based compensation costs for stock options granted

The weighted average assumptions used to compute the stock-based compensation costs for the stock options granted during the years ended December 31, 2019 and 2018 are as follows:

	Year Ended December 31,
	2019			2018
Risk-free interest rate		2.00	%		2.85	%
Expected dividend yield		—			—
Weighted average expected life (years)		6.09			6.08
Volatility		80.76	%		78.54	%

Summary of compensation cost for stock-based compensation arrangements

The compensation cost that has been included in the Company’s consolidated statements of operations for all stock-based compensation arrangements is detailed as follows (in thousands):

	Year Ended December 31,
	2019		2018
Cost of revenues	$	146	$	73
Research and development		752		351
Sales, general and administrative		10,058		4,880
Total	$	10,956	$	5,304

Computation of Basic and Diluted Loss Per Share

The following table sets forth the computation of basic and diluted loss per share (in thousands, except per share data):

	Year Ended December 31,
	2019			2018
Numerator:
Net loss, basic and diluted	$	(57,002	)	$	(42,463	)
Denominator:
Weighted average common shares outstanding		52,520			35,402
Weighted average unvested common shares subject to repurchase		(286	)		(87	)
Weighted average common shares outstanding - basic and diluted		52,234			35,315
Net loss per share, basic and diluted	$	(1.09	)	$	(1.20	)

Weighted-average anti-dilutive securities not included in diluted net loss per share

The anti-dilutive securities not included in diluted net loss per share were as follows calculated on a weighted average basis (in thousands):

	Year Ended December 31,
	2019		2018
Options to purchase common stock		4,215		4,682
Warrants to purchase common stock		26,557		22,302
Series A convertible preferred stock		67		2,022
Unvested restricted stock awards		6,727		3,270
Convertible notes		—		988
		37,566		33,264