Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Condensed Consolidated Statements of Operations
Collaboration and other research and development revenues	$ 14,519	$ 6,282	$ 25,818	$ 10,061
Revenue type	us-gaap:ServiceMember		us-gaap:ServiceMember
Operating expenses:
Research and development	$ 17,443	20,396	$ 71,460	56,735
General and administrative	13,334	12,635	41,832	36,817
Total operating expenses	30,777	33,031	113,292	93,552
Operating loss	(16,258)	(26,749)	(87,474)	(83,491)
Other income (expense), net:
Other (expense) income, net	(4)	196	332	458
Interest income (expense), net	1,024	(46)	2,243	(1,102)
Total other income (expense), net	1,020	150	2,575	(644)
Net loss	$ (15,238)	$ (26,599)	$ (84,899)	$ (84,135)
Net loss per share attributable to common stockholders, basic and diluted	$ (0.32)	$ (0.64)	$ (1.81)	$ (2.13)
Weighted-average common shares outstanding, basic and diluted	47,414,271	41,307,092	46,791,322	39,558,553

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1337-109256