Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Jan. 01, 2021	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Long-term debt				$ 54,556
Additional paid in capital	$ (406,988)			(423,759)
Accumulated deficit	320,640			314,666
Past-due rent receivables from sublease	$ 1,700			$ 1,200
Inventory excess and obsolescence charges, favorable impact on gross margin percentage	2.20%
Inventory excess and obsolescence charges, unfavorable impact on gross margin percentage		5.60%
ASU 2020-06
Significant Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted			true
Change in accounting principle, accounting standards update, adoption date			Jan. 01, 2021
Change in accounting principle, accounting standards update, immaterial effect			false
ASU 2020-06 | Change in Accounting Method Accounted for as Change in Estimate | Revision of Prior Period, Accounting Standards Update, Adjustment
Significant Accounting Policies [Line Items]
Long-term debt			$ 29,300
Additional paid in capital			32,700
Accumulated deficit			$ 3,400