Revision of Prior Period Financial Statements - Schedule of Revised Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Assets
Cash and cash equivalents	$ 56,514	$ 20,462	$ 28,101
Accounts receivable, net of allowances for doubtful accounts of $11,840 and $9,049 as of March 31, 2020 and December 31, 2019, respectively	24,211	23,867	26,771
Prepaid expenses and other current assets	4,223	4,337	3,670
Total current assets	154,431	172,792	91,553
Property and equipment, net	28,454	26,464	10,278
Operating lease right-of-use assets	89,249	90,124	8,962
Total assets	282,940	306,212	115,229
Liabilities and Stockholders’ Equity
Accrued liabilities	23,247	32,714	20,536
Deferred revenue	1,115	1,251	1,262
Operating lease liabilities, current portion			4,841
Total current liabilities	42,845	52,066	28,728
Operating lease liabilities, noncurrent portion	85,042	85,748	3,931
Total liabilities	157,963	170,803	67,581
Additional paid-in capital	394,507	395,695	261,672
Accumulated other comprehensive income	364	82	27
Accumulated deficit	(269,919)	(260,393)	(214,075)
Total stockholders’ equity	124,977	135,409	47,648	$ 52,137
Total liabilities and stockholders’ equity	$ 282,940	$ 306,212	115,229
As Reported
Assets
Cash and cash equivalents			28,235
Accounts receivable, net of allowances for doubtful accounts of $11,840 and $9,049 as of March 31, 2020 and December 31, 2019, respectively			28,252
Prepaid expenses and other current assets			3,810
Total current assets			93,308
Property and equipment, net			10,208
Operating lease right-of-use assets			9,232
Total assets			117,184
Liabilities and Stockholders’ Equity
Accrued liabilities			20,099
Deferred revenue			1,309
Operating lease liabilities, current portion			5,052
Total current liabilities			28,549
Operating lease liabilities, noncurrent portion			3,990
Total liabilities			67,461
Additional paid-in capital			261,231
Accumulated other comprehensive income			2
Accumulated deficit			(211,534)
Total stockholders’ equity			49,723
Total liabilities and stockholders’ equity			117,184
Adjustment
Assets
Cash and cash equivalents			(134)
Accounts receivable, net of allowances for doubtful accounts of $11,840 and $9,049 as of March 31, 2020 and December 31, 2019, respectively			(1,481)
Prepaid expenses and other current assets			(140)
Total current assets			(1,755)
Property and equipment, net			70
Operating lease right-of-use assets			(270)
Total assets			(1,955)
Liabilities and Stockholders’ Equity
Accrued liabilities			437
Deferred revenue			(47)
Operating lease liabilities, current portion			(211)
Total current liabilities			179
Operating lease liabilities, noncurrent portion			(59)
Total liabilities			120
Additional paid-in capital			441
Accumulated other comprehensive income			25
Accumulated deficit			(2,541)
Total stockholders’ equity			(2,075)
Total liabilities and stockholders’ equity			$ (1,955)