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Stockholders' Equity - Summary of RSU Activity (Details) - 2013 Equity Incentive Plan - USD ($) |  | 6 Months Ended
--- | --- | ---
Jan. 09, 2014 | Jun. 30, 2020
Restricted Stock Units information |  |
Period for unrecognized compensation expense related to unvested options yet has not been recognized |  | 2 years 6 months
Upon first anniversary of start date |  |
Restricted Stock Units information |  |
Percent of shares subject to option grant that will vest | 25.00% |
RSU |  |
NUMBER OF SHARES |  |
Unvested at beginning of period |  | 324,550
Forfeited |  | (12,382)
Unvested at end of period |  | 312,168
WEIGHTED-AVERAGE GRANT DATE FAIR VALUE |  |
Unvested at beginning of period |  | $ 4.53
Forfeited |  | 4.53
Unvested at end of period |  | $ 4.53
RSU | Non-executive employees |  |
Restricted Stock Units information |  |
Unrecognized compensation expense related to unvested service RSUs |  | $ 858,158
Period for unrecognized compensation expense related to unvested options yet has not been recognized |  | 1 year 2 months 12 days

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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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