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Schedule of Stock Option Activity (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Option Indexed to Issuer's Equity [Line Items]
Number of shares, Balance at end of the period (in shares)	3,915,790		3,915,790
Weighted average exercise price, Balance at end of the period (in dollars per share)	$ 3.16		$ 3.16
Number of shares, Options exercisable (in shares)	2,528,729		2,528,729
Weighted average exercise price, Options exercisable (in dollars per share)	$ 4.24		$ 4.24
Share-based Payment Arrangement, Option [Member]
Option Indexed to Issuer's Equity [Line Items]
Number of shares, Balance at beginning of the period (in shares)			3,564,458
Weighted average exercise price, Balance at beginning of the period (in dollars per share)			$ 3.36
Number of shares, Options granted (in shares)	66,000	113,000	376,000	739,000
Weighted average exercise price, Options granted (in dollars per share)			$ 1.44
Number of shares, Options exercised (in shares)	0	0	(4,584)	0
Weighted average exercise price, Options exercised (in dollars per share)			$ 1.46
Number of shares, Options forfeited (in shares)
Weighted average exercise price, Options forfeited (in dollars per share)
Number of shares, Options cancelled (in shares)			(20,084)
Weighted average exercise price, Options cancelled (in dollars per share)			$ 6.45
Number of shares, Balance at end of the period (in shares)	3,915,790		3,915,790
Weighted average exercise price, Balance at end of the period (in dollars per share)	$ 3.16		$ 3.16
Number of shares, Options exercisable (in shares)	2,528,729		2,528,729
Weighted average exercise price, Options exercisable (in dollars per share)	$ 4.24		$ 4.24

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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

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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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