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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Summary of Significant Accounting Policies

Schedule of assets recorded at fair value

The Company measures the fair value of financial assets using the highest level of inputs that are reasonably available as of the measurement date. The assets recorded at fair value are classified within the hierarchy as follows for the periods reported (in thousands):

		December 31, 2018
		Total
		Fair Value			Level 1			Level 2
Money Market Funds in Cash and Cash Equivalents		$	18,270		$	18,270		$	—
Corporate Securities			104,967			—			104,967
Government Securities			399,256			—			399,256
		$	522,493		$	18,270		$	504,223
		December 31, 2017
		Total
		Fair Value			Level 1			Level 2
Money Market Funds in Cash and Cash Equivalents		$	5,175		$	5,175		$	—
Corporate Securities			123,270			—			123,270
Government Securities			223,530			—			223,530
		$	351,975		$	5,175		$	346,800

Schedule of useful lives by asset category

Computers, software and equipment		3 - 5 years
Furniture and fixtures		5 - 7 years
Leasehold improvements		5 - 7 years or remaining
		lease term, whichever is less

Schedule of indefinite-lived intangible assets

The carrying amount and accumulated amortization of patents, licenses, and other intangibles is as follows (in thousands):

		December 31,
		2018			2017
Patents, definite life		$	9,320		$	8,915
Patents, pending issuance			5,644			4,360
Licenses and other amortizable intangible assets			2,011			2,011
Nonamortizable intangible assets (trademarks)			399			399
Total gross carrying amount			17,374			15,685
Accumulated amortization—patents			(4,142)			(3,413)
Accumulated amortization—licenses and other			(1,263)			(1,124)
Total intangible assets, net		$	11,969		$	11,148

Future amortization expense for patents, licenses, and other intangible assets

		Year ended
		December 31,
		(in thousands)
2019		$	862
2020			860
2021			757
2022			730
2023			659
Thereafter			1,923
Total		$	5,791

Schedule of potentially dilutive securities

		Year Ended
		December 31,
		2018		2017		2016
		(in thousands)
Options to purchase common stock		1,881		1,291		—
Employee stock purchase plan shares		3		—		—
Total		1,884		1,291		—

Schedule of basic and diluted net income (loss) per common share

		Year Ended December 31,
		2018			2017			2016
		(in thousands, except share and per share data)
					(As Revised)			(As Revised)
Basic
Numerator:
Net income (loss) attributable to common stockholders for basic net income (loss) per share		$	(70,409)		$	(38,486)		$	45,125
Denominator:
Weighted-average common shares outstanding			53,942,116			46,817,756			41,267,329
Basic net income (loss) per common share		$	(1.31)		$	(0.82)		$	1.09
Diluted
Numerator:
Net income (loss) attributable to common stockholders for diluted net income (loss) per share		$	(70,409)		$	(38,486)		$	45,125
Denominator:
Weighted average number of common shares outstanding used in computing basic net income (loss) per common share			53,942,116			46,817,756			41,267,329
Dilutive effect of employee stock options and ESPP			—			—			1,121,538
Weighted-average number of common shares outstanding used in computing diluted net income (loss) per common share			53,942,116			46,817,756			42,388,867
Diluted net income (loss) per common share		$	(1.31)		$	(0.82)		$	1.07

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