Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Depreciation Useful lives

Depreciation is calculated on a straight-line basis over the estimated useful lives of the respective assets and primarily consists of the following:

Computer equipment and software	3 years
Furniture and fixtures	3-7 years
Leasehold improvements	Shorter of estimated useful life or lease term

Schedule of Computation of Basic and Diluted Net Loss per Share

The following table presents the computation of basic and diluted loss from continuing operations per share (in thousands, except per share amounts):

	Year Ended December 31,
	2019		2018		2017
Numerator
Net loss from continuing operations	$	(419,503)	$	(123,716)	$	(126,022)
Denominator
Weighted average common shares outstanding, basic and diluted	43,078		37,884		27,301
Loss from continuing operations per share, basic and diluted	$	(9.74)	$	(3.27)	$	(4.62)

Schedule of Potential Common Shares Excluded From Calculation of Diluted Net Loss per Share

The following table presents the potential common shares outstanding that were excluded from the computation of diluted loss from continuing operations per share of common stock for the periods presented because including them would have been antidilutive (in thousands):

	Year Ended December 31,
	2019	2018	2017
Shares subject to outstanding common stock options	4,085	3,770	3,865
Shares subject to outstanding restricted stock units	382	289	237
Shares subject to outstanding warrants to purchase common stock	28	33	282
	4,495	4,092	4,384

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The adoption of Topic 842 did not have a material impact on our consolidated statements of operations and cash flows. The impact on our consolidated balance sheet as of January 1, 2019 was as follows (in thousands):

	December 31, 2018		Adjustments Due to the Adoption of Topic 842		January 1, 2019
Assets
Operating lease right-of-use assets	$	—	$	8,641	$	8,641
Liabilities
Other accrued liabilities	1,845		$	(363)	$	1,482
Current portion of operating lease liabilities	—		1,058		1,058
Operating lease liabilities, net of current portion	—		11,776		11,776
Deferred rent and lease incentive obligation	3,830		(3,830)		—
Total	$	5,675	$	8,641	$	14,316