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Common Stock (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Vote shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Jul. 31, 2015 shares
Common Stock, Capital Shares Reserved for Future Issuance	12,030,284	10,433,255
Common Stock
Voting rights per share | Vote	1
Dividends, Common Stock | $	$ 0	$ 0	$ 0
Stock options | Common Stock
Common Stock, Capital Shares Reserved for Future Issuance	280,000	175,000
2013 Plan
Common Stock, Capital Shares Reserved for Future Issuance				6,317,769
2013 Plan | Stock options | Common Stock
Common Stock, Capital Shares Reserved for Future Issuance	174,362	312,342
2015 Plan | Common Stock
Common Stock, Capital Shares Reserved for Future Issuance	5,599,450	4,061,357
2015 Plan | Stock options | Common Stock
Common Stock, Capital Shares Reserved for Future Issuance	3,839,345	4,254,357
2015 Employee Stock Purchase Plan
Common Stock, Capital Shares Reserved for Future Issuance	2,137,127	1,630,199

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- Definition

The number of votes to which each share of common stock is entitled.

+ References

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

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