As discussed in Note 1, the Company has revised certain prior period financial statements to correct immaterial errors in its accounting for revenues, contractual allowances, allowance for doubtful accounts and certain other items as presented below (in thousands, except share data):

Revised Consolidated Balance Sheets



	As of June 30, 2019
	As Reported			Adjustment			As Revised
Assets
Cash and cash equivalents	$	16,154		$	(170	)	$	15,984
Accounts receivable, net	29,137			(2,444		)	26,693
Prepaid expenses and other current assets	3,669			(141		)	3,528
Total current assets	94,974			(2,755		)	92,219
Property and equipment, net	12,618			826			13,444
Operating lease right-of-use assets	94,326			(83		)	94,243
Other assets	4,515			(18		)	4,497
Total assets	207,295			(2,030		)	205,265
Liabilities and Stockholders’ Equity
Current liabilities:
Accrued liabilities	23,304			58			23,362
Deferred revenue	1,199			(118		)	1,081
Operating lease liabilities, current portion	7,384			(224		)	7,160
Total current liabilities	35,654			(284		)	35,370
Operating lease liabilities, noncurrent portion	88,106			110			88,216
Total liabilities	158,687			(174		)	158,513
Additional paid-in capital	271,551			(82		)	271,469
Accumulated other comprehensive income	35			25			60
Accumulated deficit	(223,001		)	(1,799		)	(224,800		)
Total stockholders’ equity	48,608			(1,856		)	46,752
Total liabilities and stockholders’ equity	207,295			(2,030		)	205,265



	As of March 31, 2019
	As Reported			Adjustment			As Revised
Assets
Cash and cash equivalents	$	28,235		$	(134	)	$	28,101
Accounts receivable, net	28,252			(1,481		)	26,771
Prepaid expenses and other current assets	3,810			(140		)	3,670
Total current assets	93,308			(1,755		)	91,553
Property and equipment, net	10,208			70			10,278
Operating lease right-of-use assets	9,232			(270		)	8,962
Total assets	117,184			(1,955		)	115,229
Liabilities and Stockholders’ Equity
Accrued liabilities	20,099			437			20,536
Deferred revenue	1,309			(47		)	1,262
Operating lease liabilities, current portion	5,052			(211		)	4,841
Total current liabilities	28,549			179			28,728
Operating lease liabilities, noncurrent portion	3,990			(59		)	3,931
Total liabilities	67,461			120			67,581
Additional paid-in capital	261,231			441			261,672
Accumulated other comprehensive income	2			25			27
Accumulated deficit	(211,534		)	(2,541		)	(214,075		)
Total stockholders’ equity	49,723			(2,075		)	47,648
Total liabilities and stockholders’ equity	117,184			(1,955		)	115,229



	As of December 31, 2018
	As Reported			Adjustment			As Revised
Assets
Accounts receivable, net	$	21,977		$	(2,187	)	$	19,790
Total current assets	106,482			(2,187		)	104,295
Total assets	119,710			(2,187		)	117,523
Liabilities and Stockholders’ Equity
Accrued liabilities	26,570			118			26,688
Deferred revenue	1,243			(20		)	1,223
Total current liabilities	30,236			98			30,334
Total liabilities	65,288			98			65,386
Accumulated other comprehensive loss	(41		)	25			(16		)
Accumulated deficit	(203,515		)	(2,310		)	(205,825		)
Total stockholders’ equity	54,422			(2,285		)	52,137
Total liabilities and stockholders’ equity	119,710			(2,187		)	117,523



	As of September 30, 2018
	As Reported			Adjustment			As Revised
Assets
Accounts receivable, net	$	20,465		$	(490	)	$	19,975
Total current assets	106,731			(490		)	106,241
Total assets	118,989			(490		)	118,499
Liabilities and Stockholders’ Equity
Accrued liabilities	19,178			269			19,447
Deferred revenue	1,174			(15		)	1,159
Total current liabilities	22,263			254			22,517
Total liabilities	55,031			254			55,285
Accumulated other comprehensive income	(29		)	10			(19		)
Accumulated deficit	(188,801		)	(754		)	(189,555		)
Total stockholders’ equity	63,958			(744		)	63,214
Total liabilities and stockholders’ equity	118,989			(490		)	118,499



	As of June 30, 2018
	As Reported			Adjustment			As Revised
Assets
Accounts receivable, net	$	19,065		$	(1,064	)	$	18,001
Total current assets	109,656			(1,064		)	108,592
Property and equipment, net	7,560			34			7,594
Total assets	120,918			(1,030		)	119,888
Liabilities and Stockholders’ Equity
Accrued liabilities	16,355			240			16,595
Total current liabilities	19,655			240			19,895
Total liabilities	52,452			240			52,692
Accumulated deficit	(178,558		)	(1,270		)	(179,828		)
Total stockholders’ equity	68,466			(1,270		)	67,196
Total liabilities and stockholders’ equity	120,918			(1,030		)	119,888



	As of March 31, 2018
	As Reported			Adjustment			As Revised
Assets
Accounts receivable, net	$	17,165		$	(25	)	$	17,140
Total current assets	111,542			(25		)	111,517
Total assets	122,321			(25		)	122,296
Liabilities and Stockholders’ Equity
Accrued liabilities	12,658			147			12,805
Total current liabilities	16,938			147			17,085
Total liabilities	49,698			147			49,845
Accumulated deficit	(166,352		)	(172		)	(166,524		)
Total stockholders’ equity	72,623			(172		)	72,451
Total liabilities and stockholders’ equity	122,321			(25		)	122,296



	As of December 31, 2017
	As Reported			Adjustment			As Revised
Assets
Accounts receivable, net	$	12,953		$	181		$	13,134
Total current assets	119,581			181			119,762
Property and equipment, net	6,221			75			6,296
Total assets	133,123			256			133,379
Liabilities and Stockholders’ Equity
Accrued liabilities	15,644			468			16,112
Total current liabilities	20,918			468			21,386
Total liabilities	53,570			468			54,038
Accumulated deficit	(156,589		)	(212		)	(156,801		)
Total stockholders' equity	79,553			(212		)	79,341
Total liabilities and stockholders’ equity	133,123			256			133,379

Revised Consolidated Statements of Operations



	Three months ended June 30, 2019									Six months ended June 30, 2019
	As Reported			Adjustment			As Revised			As Reported			Adjustment			As Revised
Revenue	$	53,331		$	(890	)	$	52,441		$	100,545		$	230		$	100,775
Cost of revenue	12,825			187			13,012			24,555			230			24,785
Gross profit	40,506			(1,077		)	39,429			75,990			—			75,990
Research and development	8,639			(806		)	7,833			15,395			(863		)	14,532
Selling, general and administrative	43,189			(1,028		)	42,161			79,894			333			80,227
Total operating expenses	51,828			(1,834		)	49,994			95,289			(530		)	94,759
Loss from operations	(11,322		)	757			(10,565		)	(19,299		)	530			(18,769		)
Other income, net	310			(15		)	295			689			(19		)	670
Loss before income taxes	(11,452		)	742			(10,710		)	(19,459		)	511			(18,948		)
Net loss	(11,467		)	742			(10,725		)	(19,486		)	511			(18,975		)
Net loss per common share, basic and diluted	(0.46		)	0.03			(0.43		)	(0.79		)	0.02			(0.77		)



	Three months ended March 31, 2019
	As Reported			Adjustment			As Revised
Revenue	$	47,214		$	1,120		$	48,334
Cost of revenue	11,730			43			11,773
Gross profit	35,484			1,077			36,561
Research and development	6,756			(57		)	6,699
Selling, general and administrative	36,705			1,361			38,066
Total operating expenses	43,461			1,304			44,765
Loss from operations	(7,977		)	(227		)	(8,204		)
Other income, net	379			(4		)	375
Loss before income taxes	(8,007		)	(231		)	(8,238		)
Net loss	(8,019		)	(231		)	(8,250		)
Net loss per common share, basic and diluted	(0.33		)	(0.01		)	(0.34		)



	Year ended December 31, 2018
	As Reported			Adjustment			As Revised
Revenue	$	147,293		$	(16	)	$	147,277
Cost of revenue	38,579			216			38,795
Gross profit	108,714			(232		)	108,482
Research and development	20,750			110			20,860
Selling, general and administrative	131,582			1,731			133,313
Total operating expenses	152,332			1,841			154,173
Loss from operations	(43,618		)	(2,073		)	(45,691		)
Other income, net	1,526			(25		)	1,501
Loss before income taxes	(48,236		)	(2,098		)	(50,334		)
Net loss	(48,280		)	(2,098		)	(50,378		)
Net loss per common share, basic and diluted	(2.02		)	(0.09		)	(2.11		)



	Three months ended September 30, 2018									Nine months ended September 30, 2018
	As Reported			Adjustment			As Revised			As Reported			Adjustment			As Revised
Revenue	$	38,104		$	337		$	38,441		$	104,138		$	1,357		$	105,495
Cost of revenue	9,949			4			9,953			28,050			(61		)	27,989
Gross profit	28,155			333			28,488			76,088			1,418			77,506
Research and development	5,164			(78		)	5,086			13,747			29			13,776
Selling, general and administrative	32,739			(116		)	32,623			94,410			1,920			96,330
Total operating expenses	37,903			(194		)	37,709			108,157			1,949			110,106
Loss from operations	(9,748		)	527			(9,221		)	(32,069		)	(531		)	(32,600		)
Other income, net	365			(10		)	355			1,082			(10		)	1,072
Loss before income taxes	(10,244		)	517			(9,727		)	(33,567		)	(541		)	(34,108		)
Net loss	(10,244		)	517			(9,727		)	(33,567		)	(541		)	(34,108		)
Net loss per common share, basic and diluted	(0.43		)	0.03			(0.40		)	(1.41		)	(0.03		)	(1.44		)



	Three months ended June 30, 2018									Six months ended June 30, 2018
	As Reported			Adjustment			As Revised			As Reported			Adjustment			As Revised
Revenue	$	35,469		$	(177	)	$	35,292		$	66,034		$	1,020		$	67,054
Cost of revenue	9,490			(4		)	9,486			18,101			(65		)	18,036
Gross profit	25,979			(173		)	25,806			47,933			1,085			49,018
Research and development	4,564			83			4,647			8,583			107			8,690
Selling, general and administrative	33,094			846			33,940			61,671			2,036			63,707
Total operating expenses	37,658			929			38,587			70,254			2,143			72,397
Loss from operations	(11,679		)	(1,102		)	(12,781		)	(22,321		)	(1,058		)	(23,379		)
Other income, net	334			4			338			717			—			717
Net loss	(12,206		)	(1,098		)	(13,304		)	(23,323		)	(1,058		)	(24,381		)
Net loss per common share, basic and diluted	(0.51		)	(0.05		)	(0.56		)	(0.99		)	(0.04		)	(1.03		)



	Three months ended March 31, 2018
	As Reported			Adjustment			As Revised
Revenue	$	30,565		$	1,197		$	31,762
Cost of revenue	8,611			(61		)	8,550
Gross profit	21,954			1,258			23,212
Research and development	4,019			24			4,043
Selling, general and administrative	28,577			1,190			29,767
Total operating expenses	32,596			1,214			33,810
Loss from operations	(10,642		)	44			(10,598		)
Other income, net	383			(4		)	379
Net loss	(11,117		)	40			(11,077		)



	Year ended December 31, 2017
	As Reported			Adjustment			As Revised
Revenue	$	98,509		$	620		$	99,129
Cost of revenue	27,708			495			28,203
Gross profit	70,801			125			70,926
Research and development	13,335			(70		)	13,265
Selling, general and administrative	84,737			515			85,252
Total operating expenses	98,072			445			98,517
Loss from operations	(27,271		)	(320		)	(27,591		)
Net loss	(29,420		)	(320		)	(29,740		)
Net loss per common share, basic and diluted	(1.30		)	(0.01		)	(1.31		)

Revised Consolidated Statements of Comprehensive Income (Loss)



	Three months ended June 30, 2019								Six months ended June 30, 2019
	As Reported			Adjustment		As Revised			As Reported			Adjustment		As Revised
Net loss	$	(11,467	)	$	742	$	(10,725	)	$	(19,486	)	$	511	$	(18,975	)
Comprehensive loss	(11,434		)	742		(10,692		)	(19,410		)	511		(18,899		)



	Three months ended September 30, 2018								Nine months ended September 30, 2018
	As Reported			Adjustment		As Revised			As Reported			Adjustment			As Revised
Net loss	$	(10,244	)	$	517	$	(9,727	)	$	(33,567	)	$	(541	)	$	(34,108	)
Net change in unrealized losses on available-for-sale securities	19			—		19			(83		)	129			46
Foreign currency translation	(10		)	10		—			(10		)	10			—
Comprehensive loss	(10,235		)	527		(9,708		)	(33,660		)	(402		)	(34,062		)



	Three months ended June 30, 2018									Six months ended June 30, 2018
	As Reported			Adjustment			As Revised			As Reported			Adjustment			As Revised
Net loss	$	(12,206	)	$	(1,098	)	$	(13,304	)	$	(23,323	)	$	(1,058	)	$	(24,381	)
Comprehensive loss	(12,159		)	(1,098		)	(13,257		)	(23,296		)	(1,058		)	(24,354		)

Revised Consolidated Statements of Cash Flows



	Six months ended June 30, 2019
	As Reported			Adjustment			As Revised
Cash flows from operating activities
Net loss	$	(19,486	)	$	511		$	(18,975	)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,292			18			1,310
Stock-based compensation	11,745			(82		)	11,663
Provision for doubtful accounts and contractual allowances	10,683			1,687			12,370
Amortization of operating lease right-of-use assets	5,061			83			5,144
Changes in operating assets and liabilities:
Accounts receivable	(17,844		)	(1,570		)	(19,414		)
Prepaid expenses and other current assets	(27		)	263			236
Other assets	(1,174		)	18			(1,156		)
Accounts payable	1,025			(6		)	1,019
Accrued liabilities	(3,187		)	(70		)	(3,257		)
Deferred revenue	(45		)	(98		)	(143		)
Operating lease liabilities	(3,724		)	(114		)	(3,838		)
Net cash used in operating activities	(16,781		)	639			(16,142		)
Cash flows from investing activities
Purchases of property and equipment	(4,468		)	(809		)	(5,277		)
Net cash provided by investing activities	11,106			(809		)	10,297
Net increase in cash, cash equivalents, and restricted cash	(3,869		)	(170		)	(4,039		)
Cash, cash equivalents and restricted cash end of period	16,154			(170		)	15,984
Supplemental disclosures of cash flow information
Property, plant and equipment costs included in liabilities	284			16			300



	Three months ended March 31, 2019
	As Reported			Adjustment			As Revised
Cash flows from operating activities
Net loss	$	(8,019	)	$	(231	)	$	(8,250	)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	4,415			441			4,856
Provision for doubtful accounts and contractual allowances	4,709			702			5,411
Changes in operating assets and liabilities:
Accounts receivable	(10,984		)	(1,408		)	(12,392		)
Prepaid expenses and other current assets	(169		)	140			(29		)
Accrued liabilities	(6,380		)	319			(6,061		)
Deferred revenue	66			(27		)	39
Net cash used in operating activities	(17,099		)	(64		)	(17,163		)
Cash flows from investing activities
Purchases of property and equipment	(1,635		)	(70		)	(1,705		)
Net cash provided by investing activities	26,449			(70		)	26,379
Net increase in cash, cash equivalents, and restricted cash	8,212			(134		)	8,078
Cash and cash equivalents end of period	28,235			(134		)	28,101



	Year ended December 31, 2018
	As Reported			Adjustment			As Revised
Cash flows from operating activities
Net loss	$	(48,280	)	$	(2,098	)	$	(50,378	)
Adjustments to reconcile net loss to net cash used in operating activities:
Provision for doubtful accounts and contractual allowances	15,218			1,230			16,448
Changes in operating assets and liabilities:
Accounts receivable	(22,885		)	1,138			(21,747		)
Accrued liabilities	10,776			(275		)	10,501
Deferred revenue	5			(20		)	(15		)
Net cash used in operating activities	(29,068		)	(25		)	(29,093		)
Cash flows from investing activities
Purchases of available-for-sale investments	(93,158		)	25			(93,133		)
Net cash provided by investing activities	34,117			25			34,142



	Nine months ended September 30, 2018
	As Reported			Adjustment			As Revised
Cash flows from operating activities
Net loss	$	(33,567	)	$	(541	)	$	(34,108	)
Adjustments to reconcile net loss to net cash used in operating activities:
Provision for doubtful accounts and contractual allowances	8,921			671			9,592
Changes in operating assets and liabilities:
Accounts receivable	(15,088		)	10			(15,078		)
Accrued liabilities	3,335			(125		)	3,210
Deferred revenue	(64		)	(15		)	(79		)



	Six months ended June 30, 2018
	As Reported			Adjustment			As Revised
Cash flows from operating activities
Net loss	$	(23,323	)	$	(1,058	)	$	(24,381	)
Adjustments to reconcile net loss to net cash used in operating activities:
Provision for doubtful accounts and contractual allowances	6,440			1,245			7,685
Changes in operating assets and liabilities:
Accrued liabilities	497			(186		)	311
Supplemental disclosures of cash flow information
Property, plant and equipment costs included in liabilities	218			34			252



	Three months ended March 31, 2018
	As Reported			Adjustment			As Revised
Cash flows from operating activities
Net loss	$	(11,117	)	$	40		$	(11,077	)
Adjustments to reconcile net loss to net cash used in operating activities:
Provision for doubtful accounts and contractual allowances	2,680			206			2,886
Changes in operating assets and liabilities:
Accrued liabilities	(2,977		)	(246		)	(3,223		)



	Year ended December 31, 2017
	As Reported		Adjustment		As Revised
Cash flows from operating activities
Net loss	(29,420	)	(320	)	(29,740	)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	10,123		(371	)	9,752
Provision for doubtful accounts and contractual allowances	9,403		(181	)	9,222
Changes in operating assets and liabilities:
Accounts receivable	(12,950	)	479		(12,471	)
Accrued liabilities	5,364		393		5,757
Supplemental disclosures of cash flow information
Property, plant and equipment costs included in liabilities	35		75		110

Revised Consolidated Statements of Shareholder's Equity



	Six months ended June 30, 2019
	As Reported			Adjustment			As Revised
Stock-based compensation expense	$	11,745		$	(82	)	$	11,663
Additional-paid-in-capital ending balance	271,551			(82		)	271,469
Accumulated other comprehensive loss beginning balance	(41		)	25			(16		)
Accumulated other comprehensive loss ending balance	35			25			60
Accumulated deficit beginning balance	(203,515		)	(2,310		)	(205,825		)
Net loss	(19,486		)	511			(18,975		)
Accumulated deficit ending balance	(223,001		)	(1,799		)	(224,800		)
Total stockholders' equity	48,608			(1,856		)	46,752



	Three months ended March 31, 2019
	As Reported			Adjustment			As Revised
Stock-based compensation expense	$	4,415		$	441		$	4,856
Additional-paid-in-capital ending balance	261,231			441			261,672
Accumulated other comprehensive loss beginning balance	(41		)	25			(16		)
Accumulated other comprehensive loss ending balance	2			25			27
Accumulated deficit beginning balance	(203,515		)	(2,310		)	(205,825		)
Net loss	(8,019		)	(231		)	(8,250		)
Accumulated deficit ending balance	(211,534		)	(2,541		)	(214,075		)
Total stockholders' equity	49,723			(2,075		)	47,648



	Year Ended December 31, 2018
	As Reported			Adjustment			As Revised
Unrealized loss on investments	$	24		$	25		$	49
Accumulated other comprehensive loss ending balance	(41		)	25			(16		)
Accumulated deficit beginning balance	(156,589		)	(212		)	(156,801		)
Net loss	(48,280		)	(2,098		)	(50,378		)
Accumulated deficit ending balance	(203,515		)	(2,310		)	(205,825		)
Total stockholders' equity	54,422			(2,285		)	52,137



	Six Months Ended June 30, 2018
	As Reported			Adjustment			As Revised
Accumulated deficit beginning balance	$	(156,589	)	$	(212	)	$	(156,801	)
Net loss	(23,323		)	(1,058		)	(24,381		)
Accumulated deficit ending balance	(178,558		)	(1,270		)	(179,828		)
Total stockholders' equity	68,466			(1,270		)	67,196



	Three Months Ended March 31, 2018
	As Reported			Adjustment			As Revised
Accumulated deficit beginning balance	$	(156,589	)	$	(212	)	$	(156,801	)
Net loss	(11,117		)	40			(11,077		)
Accumulated deficit ending balance	(166,352		)	(172		)	(166,524		)
Total stockholders' equity	72,623			(172		)	72,451



	Year Ended December 31, 2017
	As Reported			Adjustment			As Revised
Accumulated deficit beginning balance	$	(127,169	)	$	108		$	(127,061	)
Net loss	(29,420		)	(320		)	(29,740		)
Accumulated deficit ending balance	(156,589		)	(212		)	(156,801		)
Total stockholders' equity	79,553			(212		)	79,341