Condensed Statements of Operations and Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 18,933	$ 12,766
Cost of goods sold	5,250	3,339
Gross profit	13,683	9,427
Operating expenses:
Research and development	3,131	2,707
Selling, general and administrative	19,692	13,866
Total operating expenses	22,823	16,573
Loss from operations	(9,140)	(7,146)
Interest income	404	52
Interest expense	(1,202)	(1,352)
Other income (expense), net	(3)	(15,712)
Net loss attributable to Silk Road Medical, Inc. common stockholders	(9,941)	(24,158)
Other comprehensive loss:
Unrealized gains on investments, net	440	0
Net change in other comprehensive loss	440	0
Net loss and comprehensive loss	$ (9,501)	$ (24,158)
Net loss per share, basic and diluted (in USD per share)	$ (0.32)	$ (20.12)
Weighted average common shares used to compute net loss per share, basic and diluted (in shares)	31,338,310	1,200,719