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Common Stock, warrants, stock-based compensation, stock options, restricted stock and restricted stock units (Tables)

12 Months Ended

Dec. 31, 2018

Common Stock, warrants, stock-based compensation, stock options, restricted stock and restricted stock units

Schedule of common stock reserved


	Year ended December 31,
	2018	2017
Common stock warrants	76,041	86,090
Common stock options and unvested restricted common stock	2,838,402	2,427,035
Shares reserved for future awards under compensation plan	2,433,999	3,500,620
	5,348,442	6,013,745

Summary of warrant activity


		Weighted
	Issued and	Average
	exercisable	Exercise Price
As of December 31, 2017	86,090	$	9.14
Issued	10,000		4.83
Exercised	(16,718)		11.73
Cancelled	(3,331)	$	11.73
As of December 31, 2018	76,041		10.10

Summary of share-based compensation expense for all stock awards


	Year ended December 31,
	2018		2017		2016
Cost of product revenue	$	55	$	24	$	6
Cost of service and other revenue		173		52		12
Research and development		513		180		59
General and administrative		4,143		1,912		851
Total	$	4,884	$	2,168	$	928

Summary of stock option activity


		Weighted-		Remaining	Aggregate
		average		contractual	intrinsic
		exercise		life	value
	Options	price		(in years)	(in thousands)
Outstanding at December 31, 2016	1,119,671	$	2.99	6.8		5,796
Granted	1,281,135	$	8.46
Exercised	(90,265)	$	2.25
Cancelled or forfeited	(60,698)	$	6.16
Outstanding at December 31, 2017	2,249,843	$	6.05	7.8		34,695
Granted	729,224	$	18.36
Exercised	(407,901)	$	4.57
Cancelled or forfeited	(94,255)	$	13.16
Outstanding at December 31, 2018	2,476,911	$	9.65	7.733	$	22,108
Vested and expected to vest at December 31, 2018	2,476,911	$	9.65	7.733	$	22,108
Exercisable at December 31, 2018	1,143,480	$	5.68	6.514	$	14,440

Summary of restricted stock activity


		Weighted-average
		grant date
		fair value
	Shares	per share
Unvested restricted common stock as of December 31, 2015	623,869	3.12
Vested	(247,621)	3.09
Unvested restricted common stock as of December 31, 2016	376,248	3.12
Vested	(199,056)	3.12
Unvested restricted common stock as of December 31, 2017	177,192	3.11
Vested	(137,386)	3.11
Unvested restricted common stock as of December 31, 2018	39,806	3.12

Summary of restricted stock units activity


		Weighted-average
		grant date
		fair value
	Shares	per share
Unvested restricted stock units as of December 31, 2017	—
Granted	422,027	$	15.65
Vested	(99,990)	$	15.02
Cancelled or Forfeited	(375)	$	18.40
Unvested restricted stock units as of December 31, 2018	321,662	$	15.84

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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