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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Assets and Liabilities Measured at Fair Value on a Recurring Basis | The following tables present the fair value hierarchy for assets and liabilities measured at fair value on a recurring basis as of December 31, 2017 and 2016 (in thousands):
|  | December 31, 2017 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 14,334 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,334 |
U.S. government agency securities(3) |  |  | 16,471 |  |  | $ | — |  |  | $ | — |  |  |  | 16,471 |
Restricted cash (money market funds)(2) |  |  | 5,333 |  |  |  | — |  |  |  | — |  |  |  | 5,333 |
Agency securities(3) |  |  | — |  |  |  | 1,500 |  |  |  | — |  |  |  | 1,500 |
Total financial assets |  | $ | 36,138 |  |  | $ | 1,500 |  |  | $ | — |  |  | $ | 37,638 |
(1) | Included in cash and cash equivalents on accompanying consolidated balance sheets.
(2) | $5.2 million of restricted cash in the Indenture serves as full collateral for the redeemable convertible notes and $0.1 million of restricted cash serves as collateral for the Company’s corporate credit card and deposit for its facility lease.
(3) | Included in short-term investments on accompanying consolidated balance sheets and are classified as available-for-sale securities.
|  | December 31, 2016 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds(1) |  | $ | 10,156 |  |  | $ | — |  |  | $ | — |  |  | $ | 10,156 |
U.S. government agency securities(3) |  |  | 6,800 |  |  |  | — |  |  |  | — |  |  |  | 6,800 |
Restricted cash (money market funds)(2) |  |  | 19,593 |  |  |  | — |  |  |  | — |  |  |  | 19,593 |
Total financial assets |  | $ | 36,549 |  |  | $ | — |  |  | $ | — |  |  | $ | 36,549 |
(1) | Included in cash and cash equivalents on accompanying consolidated balance sheets.
(2) | $19.4 million of restricted cash in the Indenture serves as full collateral for the redeemable convertible notes and $0.1 million of restricted cash serves as collateral for the Company’s corporate credit card and deposit for its facility lease.
(3) | Included in short-term investments on accompanying consolidated balance sheets and are classified as available-for-sale securities.

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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