Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Revenue	$ 63,354	$ 34,557
Cost of goods sold	15,927	10,874
Gross profit	47,427	23,683
Operating expenses:
Research and development	12,272	10,258
Selling, general and administrative	63,220	34,820
Total operating expenses	75,492	45,078
Loss from operations	(28,065)	(21,395)
Interest income	1,656	189
Interest expense	(4,952)	(4,361)
Other income (expense), net	(21,054)	(12,063)
Nett loss	(52,415)	(37,630)
Net loss attributable to non-controlling interest	0	1
Net loss attributable to Silk Road Medical, Inc. common stockholders	(52,415)	(37,629)
Other comprehensive loss:
Unrealized gain on investments, net	2	0
Net change in other comprehensive loss	2	0
Net loss and comprehensive loss attributable to Silk Road Medical, Inc. common stockholders	$ (52,413)	$ (37,629)
Net loss per share attributable to Silk Road Medical, Inc. common stockholders, basic and diluted (in USD per share)	$ (2.28)	$ (39.16)
Weighted average common shares used to compute net loss per share attributable to Silk Road Medical, Inc. common stockholders, basic and diluted (in shares)	22,956,679	960,882