Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2019

Significant Accounting Policies [Line Items]

The impact of the adoption of Topic 606 on contract liabilities and accumulated deficit balances as of January 1, 2019 was as follows (in thousands):

	December 31, 2018			Adjustment Due to the Adoption of Topic 606			January 1, 2019
Current portion of deferred revenue	$	6,250		$	750		$	7,000
Long-term portion of deferred revenue		16,984			(2,962	)		14,022
Accumulated deficit	$	(122,828	)	$	2,212		$	(120,616	)

The impact of the adoption of Topic 606 on the Company’s Condensed Consolidated Balance Sheet and Statement of Operations as of and for the period ended June 30, 2019 was as follows (in thousands):

	As of June 30, 2019
	As Reported		Balances without the Adoption of Topic 606		Effect of Adoption Higher/ (Lower)
Current portion of deferred revenue	$	7,000	$	6,250	$	750
Long-term portion of deferred revenue		10,522		13,859		(3,337	)
Accumulated deficit	$	—	$	—	$	(2,399	)

	Three Months Ended June 30, 2019
	As Reported			Without the Adoption of Topic 606			Effect of Adoption Higher/ (Lower)
Collaboration revenues	$	1,750		$	1,563		$	187
Net loss		(28,090	)		(28,277	)	$	187
Net loss per share, basic and diluted	$	(0.64	)	$	(0.65	)	$	—

	Six Months Ended June 30, 2019
	As Reported			Without the Adoption of Topic 606			Effect of Adoption Higher/ (Lower)
Collaboration revenues	$	3,500		$	3,126		$	374
Net loss		(45,760	)		(46,134	)	$	374
Net loss per share, basic and diluted	$	(1.05	)	$	(1.06	)	$	—

ASU 2016-18

Significant Accounting Policies [Line Items]

Impact of Adoption

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the condensed consolidated balance sheets that sum to the total of the same such amount shown on the condensed consolidated statements of cash flows (in thousands):

	June 30, 2019		December 31, 2018		June 30, 2018		December 31, 2017
Cash and cash equivalents	$	76,068	$	71,064	$	169,998	$	98,426
Restricted cash		203		203		203		203
Cash, cash equivalents and restricted cash	$	76,271	$	71,267	$	170,201	$	98,629