Description of Business and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2020

Accounting Policies [Abstract]

Summary of Revenue from Services

For the three and nine months ended September 30, 2020 and 2019, revenue from these services consisted of the following (in thousands):

	Three months ended September 30,				Nine months ended September 30,
	2020		2019		2020		2019
Diagnostic tests	$	8,552	$	3,770	$	15,798	$	12,716
Services		641		172		2,730		3,565
Total revenue	$	9,193	$	3,942	$	18,528	$	16,281

Schedule of Computation of Basic and Diluted Net Loss per Share Attributable to Common Stockholders

The following table sets forth the computation of the basic and diluted net loss per share attributable to common stockholders (in thousands, except per share amounts):

	Three months ended September 30,						Nine months ended September 30,
	2020			2019			2020			2019
Numerator
Net loss attributable to common stockholders	$	(8,845	)	$	(9,601	)	$	(26,817	)	$	(24,201	)
Denominator
Weighted-average shares outstanding used    in computing net loss per share, basic and diluted		277			244			269			233
Net loss per share, basic and diluted	$	(31.93	)	$	(39.35	)	$	(99.69	)	$	(103.87	)

Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share Attributable to Common Stockholders

The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive for the three and nine month periods ended September 30, 2020 and 2019 (in thousands):

	Nine months ended September 30,
	2020		2019
Options to purchase common stock		2,843		2,010
Convertible preferred stock		119,257		119,257
Warrants		613		2,440
Restricted stock units		79		26
Convertible debt (1)		20,746		16,240
Total		143,538		139,973

(1) The number of common shares that convertible debt was assumed to convert to was based on the Company’s estimated common stock price as of September 30, 2020, as determined by the Company’s board of directors (“Board of Directors”) with assistance from a valuation firm.