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Fair value of financial instruments and investments (Tables) | 12 Months Ended
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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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- Definition 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. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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