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Fair value of financial instruments and investments (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of financial assets and liabilities that are required to be measured at fair value on a recurring basis

The following represents the fair value using the hierarchy described in Note 2 for the Company’s financial assets and liabilities that are required to be measured at fair value on a recurring basis as of December 31, 2017 and 2016:

		December 31, 2017
		Total				Quoted prices in active markets for identical assets (level 1)				Significant other observable inputs (level 2)				Significant unobservable inputs (level 3)
Marketable securities		$	79,454			$	—			$	79,454			$	—
Warrant liability		$	1			—				—				1
Stock appreciation rights liability		$	1,665			—				—				1,665

		December 31, 2016
		Total				Quoted prices in active markets for identical assets (level 1)				Significant other observable inputs (level 2)				Significant unobservable inputs (level 3)
Marketable securities		$	173,345			$	—			$	173,345			$	—
Warrant Liability		$	1			—				—				1
Stock appreciation rights liability		$	865			—				—				865

Summary of marketable securities accounted for as available-for-sale securities

The following is a summary of marketable securities accounted for as available-for-sale securities at December 31, 2017 and 2016:

		December 31, 2017
		Amortized Cost				Gross Unrealized								Fair Value
													Gains					Losses
Commercial paper					$	13,775			$	52			$	—				$	13,827
Corporate debt securities		65,657				—				(30		)		65,627
Government obligations		—				—				—				—
		$	79,432			$	52			$	(30	)		$	79,454

		December 31, 2016
		Amortized Cost				Gross Unrealized								Fair Value
													Gains					Losses
Commercial paper					$	12,919			$	47			$	—				$	12,966
Corporate debt securities		153,240				52				(103		)		153,189
Government obligations		7,188				2				—				7,190
		$	173,347			$	101			$	(103	)		$	173,345

Available-for-sale securities, continuous unrealized loss position, fair value

The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of December 31, 2017 are as follows:

		December 31, 2017
		Securities in an unrealized loss position less than 12 months								Securities in an unrealized loss position greater than 12 months								Total
		Unrealized losses				Fair Value				Unrealized losses				Fair Value				Unrealized losses				Fair Value
Corporate debt securities		$	(28	)		$	59,108			$	(2	)		$	6,519			$	(30	)		$	65,627

The unrealized losses and fair values of available-for-sale securities that have been in an unrealized loss position for a period of less than and greater than 12 months as of December 31, 2016 are as follows:

		December 31, 2016
		Securities in an unrealized loss position less than 12 months								Securities in an unrealized loss position greater than 12 months								Total
		Unrealized losses				Fair Value				Unrealized losses				Fair Value				Unrealized losses				Fair Value
Corporate debt securities		$	(85	)		$	45,482			$	(18	)		$	51,243			$	(103	)		$	96,725

Schedule of marketable securities on the balance sheet

Marketable securities on the balance sheet at December 31, 2017 and 2016 mature as follows:

		December 31, 2017
		Less Than 12 Months				More Than 12 Months
Commercial paper		$	13,827			$	—
Corporate debt securities		55,550				10,077
Government obligations		—				—
Total Marketable securities		$	69,377			$	10,077

		December 31, 2016
		Less Than 12 Months				More Than 12 Months
Commercial paper		$	12,966			$	—
Corporate debt securities		137,196				15,993
Government obligations		7,190				—
Total Marketable securities		$	157,352			$	15,993

Summary of changes in the fair value of the Company's Level 3 valuation for warrant liability

The table presented below is a summary of changes in the fair value of the Company’s Level 3 valuation for the warrant liability and SARs liability for the years ended December 31, 2017 and 2016:

		Level 3 liabilities
		Warrants				SARs
Beginning balance as of December 31, 2015		$	48			$	—
Fair value of issuances		—				140
Change in fair value		(47		)		725
Ending balance as of December 31, 2016		$	1			$	865
Fair value of issuances		—				—
Change in fair value		—				1,864
Payments		$	—			$	(1,064	)
Ending balance as of December 31, 2017		$	1			$	1,665

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Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability.

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