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Fair value of financial instruments and marketable securities (Tables)

6 Months Ended

Jun. 30, 2018

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 above for the Company’s financial assets and liabilities that are required to be measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017:

		June 30, 2018
		Total				Quoted prices in active markets for identical assets (level 1)				Significant other observable inputs (level 2)				Significant unobservable inputs (level 3)
Marketable securities		$	72,318			$	—			$	72,318			$	—
Warrant liability		$	1			$	—			$	—			$	1
Stock appreciation rights liability		$	2,274			$	—			$	—			$	2,274

		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

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 June 30, 2018 and December 31, 2017:

		June 30, 2018
		Amortized Cost				Gross Unrealized								Fair Value
						Gains				Losses
Commercial paper		$	26,322			$	7			$	(1	)		$	26,328
Corporate debt securities		46,057				—				(67		)		45,990
		$	72,379			$	7			$	(68	)		$	72,318

		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
		$	79,432			$	52			$	(30	)		$	79,454

Summary of unrealized losses and fair values of available-for-sale securities in a continuous unrealized loss position

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 June 30, 2018 are as follows:

		June 30, 2018
		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
Commercial paper		$	(1	)		$	10,457			$	—			$	—			$	(1	)		$	10,457
Corporate debt securities		(67		)		45,990				—				—				(67		)		45,990
		$	(68	)		$	56,447			$	—			$	—			$	(68	)		$	56,447

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

Schedule of marketable securities on the balance sheet

Marketable securities on the balance sheet at June 30, 2018 and December 31, 2017 mature as follows:

		June 30, 2018
		Less Than 12 Months				More Than 12 Months
Commercial paper		$	26,328			$	—
Corporate debt securities		45,990				—
Total Marketable securities		$	72,318			$	—

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

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

The table presented below is a summary of changes in the fair value of the Company’s Level 3 valuations for the warrant liability and SARs liability for the period ended June 30, 2018:

		Level 3 liabilities
		Warrants				SARs
Beginning balance as of December 31, 2017		$	1			$	1,665
Change in fair value		—				2,600
Payments		—				(1,991		)
Ending balance as of June 30, 2018		$	1			$	2,274

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Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities.

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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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-Publisher FASB
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-Topic 820
-SubTopic 10
-Section 50
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Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

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-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
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