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Stockholders' Equity - Summary of Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Number of Options
Outstanding at beginning of period (in shares)	155,031	58,574
Granted (in shares)	112,350	137,860
Canceled (in shares)	(33,774)	(35,499)
Expired (in shares)		(5,505)
Exercised (in shares)	(12,157)	0
Outstanding at end of period (in shares)	221,450	155,031
Vested and expected to vest (in shares)	177,827
Exercisable (in shares)	38,465
Weighted Average Exercise Price Per Share
Outstanding at beginning of period (in dollars per share)	$ 5.23	$ 18.90
Granted (in dollars per share)	2.68	2.20
Canceled (in dollars per share)	9.56	12.75
Expired (in dollars per share)		26.65
Exercised (in dollars per share)	2.11
Outstanding at end of period (in dollars per share)	3.45	$ 5.23
Vested and expected to vest (in dollars per share)	3.62
Exercisable (in dollars per share)	$ 7.88

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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