Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2020

Accounting Policies [Abstract]

Schedule of assets and liabilities measured at fair value on a recurring basis

The following tables sets forth by level within the fair value hierarchy our assets that are measured on a recurring basis and reported at fair value as of September 30, 2020 and December 31, 2019. Assets are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

	Fair Value Measurements as of
	September 30, 2020
	Estimated Fair Value		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	170,076	$	170,076	$	—	$	—
Total cash equivalents	170,076		170,076		—		—
Investments:
Commercial paper	$	13,264	$	—	$	13,264	$	—
Corporate bonds	6,579		—		6,579		—
U.S. government securities	36,089		36,089		—		—
Total investments	55,932		36,089		19,843		—
Total cash equivalents and investments	$	226,008	$	206,165	$	19,843	$	—

	Fair Value Measurements as of
	December 31, 2019
	Estimated Fair Value		Level 1		Level 2		Level 3
Cash equivalents:
Money market funds	$	18,429	$	18,429	$	—	$	—
Total cash equivalents	18,429		18,429		—		—
Investments:
Commercial paper	$	14,214	$	—	$	14,214	$	—
Corporate bonds	32,485		—		32,485		—
Asset-backed securities	8,100		—		8,100		—
U.S. government securities	78,082		78,082		—		—
Total investments	132,881		78,082		54,799		—
Total cash equivalents and investments	$	151,310	$	96,511	$	54,799	$	—

Schedule of inventory

Inventories are valued at the lower of cost or net realizable value, computed on a first-in, first-out basis and consisted of the following:

	September 30, 2020		December 31, 2019
Raw materials	$	960	$	781
Finished goods	8,006		5,053
Total inventories, net of reserves	$	8,966	$	5,834

Schedule of property and equipment

Property and equipment are stated at cost, less accumulated depreciation and amortization and consisted of the following:

	September 30, 2020		December 31, 2019
Computer equipment and software	$	1,305	$	790
Manufacturing equipment	2,141		1,050
Other equipment	209		68
Leasehold improvements	192		192
Construction in process	2,054		1,950
Property and equipment, cost	5,901		4,050
Less: accumulated depreciation and amortization	(1,592)		(1,005)
Property and equipment, net	$	4,309	$	3,045

Schedule of accrued expenses

Accrued expenses consisted of the following:

	September 30, 2020		December 31, 2019
Payroll related	$	10,087	$	10,304
Interest	155		160
Current operating lease liability	85		828
Other accrued expenses	1,128		1,105
Total accrued expenses	$	11,455	$	12,397