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Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2019

Summary of Significant Accounting Policies [Abstract]

Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis



	March 31, 2019												December 31, 2018
(in thousands)	Level 1			Level 2			Level 3			Total			Level 1			Level 2			Level 3			Total
Assets
Cash and cash equivalents:
Cash and money market funds	$	29,329		$	—		$	—		$	29,329		$	18,844		$	—		$	—		$	18,844
Commercial paper		—			8,876			—			8,876			—			—			—			—
Total cash and cash equivalents		29,329			8,876			—			38,205			18,844			—			—			18,844
Investments:
Commercial paper		—			31,306			—			31,306			—			53,469			—			53,469
Corporate debt securities		—			6,979			—			6,979			—			10,214			—			10,214
US government & agency securities		—			6,382			—			6,382			—			19,827			—			19,827
Total investments		—			44,667			—			44,667			—			83,510			—			83,510
Long-term restricted cash:
Cash		4,500			—			—			4,500			4,500			—			—			4,500
Total assets measured at fair value	$	33,829		$	53,543		$	—		$	87,372		$	23,344		$	83,510		$	—		$	106,854

Liabilities
Financing derivative	$	—		$	—		$	—		$	—		$	—		$	—		$	16		$	16
Total liabilities measured at fair value	$	—		$	—		$	—		$	—		$	—		$	—		$	16		$	16




Estimated Fair Value and Carrying Value of Notes



	March 31, 2019						December 31, 2018
	Fair Value			Carrying Value			Fair Value			Carrying Value
Notes payable	$	16,083		$	14,938		$	15,915		$	14,659



Anti-dilutive Shares Excluded from Computation of Diluted Net Loss per Share



		Three Months Ended March 31,
(in thousands)		2019		2018
Options to purchase common stock		23,833		28,879
RSUs with time-based vesting		1,102		355
RSUs with performance-based vesting		138		652



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Carrying Values And Estimated Fair Values Of Debt Table [Text Block]

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Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

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Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

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