Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Measurements

Schedule of financial instruments measured at fair value by level within the fair value hierarchy

	Level 1		Level 2		Level 3
2019
Assets:
Cash equivalents	$	34,444	$	—	$	—
Total assets at fair value	$	34,444	$	—	$	—

	Level 1		Level 2		Level 3
2018
Assets:
Cash equivalents	$	7,776	$	—	$	—
Total assets at fair value	$	7,776	$	—	$	—

Schedule of rollforward of the fair value of Level 3 warrants

Beginning balance at December 31, 2016	$	172
Change in fair value		(143)
Ending balance at December 31, 2017		29
Change in fair value		(29)
Ending balance at December 31, 2018		—
Change in fair value		—
Ending balance at December 31, 2019	$	—