Stock Benefit Plans and Equity Transactions (Tables)

9 Months Ended

Sep. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Total Stock Based Compensation

Total stock-based compensation for the three and nine months ended September 30, 2019 and 2018 is as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Cost of revenues	$	57	$	18	$	113	$	51
Research and development		388		179		921		192
Sales, general and administrative		3,158		1,478		6,532		3,199
Total	$	3,603	$	1,675	$	7,566	$	3,442

Summary of Common Stock Reserved for Future Issuance

As of September 30, 2019, the Company had reserved shares of its common stock for future issuance as follows (in thousands):

	September 30, 2019
Stock options outstanding		4,270
Unvested restricted stock award		6,755
Employee stock purchase plan		130
Series A convertible preferred stock		67
Warrants outstanding		26,739
Authorized for future grant under the Distributor and     Development Services plans		3,908
Authorized for future grant under the Company equity plans		1,529
Total		43,398

Summary of Outstanding Warrants

A summary of all outstanding warrants is as follows:

	Number of Warrants		Strike Price
2017 Common Stock Warrants		3,357,000	$	2.00
2017 Banker Warrants		148,554	$	2.50
2018 Common Stock Warrants		13,827,473	$	3.50
Merger Warrants		2,200,000	$	3.50
Executive		1,327,434	$	5.00
Squadron Capital		845,000	$	3.15
Squadron Capital		4,838,710	$	2.17
Other		195,312	$	3.85	*
Total		26,739,483

* - Represents weighted average exercise price.