CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018		94,465,440
Beginning balance at Dec. 31, 2018	$ 320,443	$ 94	$ 340,291	$ (579)	$ (19,363)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issuance ESPP Plan (in shares)		36,032
Common stock issuance ESPP Plan	419		419
Stock issuance fees and expenses	(66)		(66)
Gain (loss) on effective cash flow hedges	(557)			(557)
Issuance of restricted stock, net of forfeitures (in shares)		(182,502)
Issuance of common stock for stock options (in shares)		619,536
Issuance of common stock for stock options	3,894	$ 1	3,893
ESPP expense	119		119
Stock-based compensation expense - options and restricted stock	2,020		2,020
NET (LOSS) INCOME	(2,424)				(2,424)
Ending balance (in shares) at Mar. 31, 2019		95,303,510
Ending balance at Mar. 31, 2019	323,848	$ 95	346,676	(1,136)	(21,787)
Beginning balance (in shares) at Dec. 31, 2018		94,465,440
Beginning balance at Dec. 31, 2018	320,443	$ 94	340,291	(579)	(19,363)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash flow hedge termination reclassified to earnings	0
NET (LOSS) INCOME	(433)
Ending balance (in shares) at Jun. 30, 2019		103,834,212
Ending balance at Jun. 30, 2019	489,734	$ 104	511,589	(2,163)	(19,796)
Beginning balance (in shares) at Mar. 31, 2019		95,303,510
Beginning balance at Mar. 31, 2019	323,848	$ 95	346,676	(1,136)	(21,787)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issuance ESPP Plan (in shares)		37,255
Common stock issuance ESPP Plan	653		653
Stock issuance fees and expenses	(211)		(211)
Gain (loss) on effective cash flow hedges	(1,027)			(1,027)
Cash flow hedge termination reclassified to earnings	0
Issuance of restricted stock, net of forfeitures (in shares)		(633)
Working capital adjustment related to acquisition (in shares)		(99,524)
Working capital adjustment related to acquisition	(1,977)		(1,977)
Issuance of common stock - Public Offering (in shares)		8,050,000
Issuance of common stock - Public Offering	160,774	$ 8	160,766
Issuance of common stock for stock options (in shares)		543,604
Issuance of common stock for stock options	3,370	$ 1	3,369
ESPP expense	162		162
Stock-based compensation expense - options and restricted stock	2,151		2,151
NET (LOSS) INCOME	1,991				1,991
Ending balance (in shares) at Jun. 30, 2019		103,834,212
Ending balance at Jun. 30, 2019	489,734	$ 104	511,589	(2,163)	(19,796)
Beginning balance (in shares) at Dec. 31, 2019		104,781,236
Beginning balance at Dec. 31, 2019	507,408	$ 105	520,278	(1,618)	(11,357)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issuance ESPP Plan (in shares)		34,330
Common stock issuance ESPP Plan	796		796
Stock issuance fees and expenses	(15)		(15)
Gain (loss) on effective cash flow hedges	(1,038)			(1,038)
Issuance of restricted stock, net of forfeitures (in shares)		(76,618)
Issuance of restricted stock, net of forfeitures	(212)		(212)
Issuance of common stock for stock options (in shares)		503,873
Issuance of common stock for stock options	2,897		2,897
ESPP expense	194		194
Stock-based compensation expense - options and restricted stock	1,991		1,991
NET (LOSS) INCOME	(6,978)				(6,978)
Ending balance (in shares) at Mar. 31, 2020		105,396,057
Ending balance at Mar. 31, 2020	505,043	$ 105	525,929	(2,656)	(18,335)
Beginning balance (in shares) at Dec. 31, 2019		104,781,236
Beginning balance at Dec. 31, 2019	507,408	$ 105	520,278	(1,618)	(11,357)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash flow hedge termination reclassified to earnings	$ 2,661
Issuance of common stock for stock options (in shares)	691,299
NET (LOSS) INCOME	$ (13,802)
Ending balance (in shares) at Jun. 30, 2020		110,396,844
Ending balance at Jun. 30, 2020	654,229	$ 110	679,235	43	(25,159)
Beginning balance (in shares) at Mar. 31, 2020		105,396,057
Beginning balance at Mar. 31, 2020	505,043	$ 105	525,929	(2,656)	(18,335)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issuance ESPP Plan (in shares)		41,058
Common stock issuance ESPP Plan	928		928
Stock issuance fees and expenses	(317)		(317)
Gain (loss) on effective cash flow hedges	38			38
Cash flow hedge termination reclassified to earnings	2,661			2,661
Issuance of restricted stock, net of forfeitures (in shares)		(24,786)
Issuance of restricted stock, net of forfeitures	(824)		(824)
Issuance of common stock - Public Offering (in shares)		4,751,500
Issuance of common stock - Public Offering	127,293	$ 5	127,288
Issuance of common stock for stock options (in shares)		183,443
Issuance of common stock for stock options	2,014		2,014
ESPP expense	211		211
Stock-based compensation expense - options and restricted stock	2,424		2,424
Equity component of convertible note issuance	30,912		30,912
Tax liability related to convertible note issuance	(9,330)		(9,330)
NET (LOSS) INCOME	(6,824)				(6,824)
Ending balance (in shares) at Jun. 30, 2020		110,396,844
Ending balance at Jun. 30, 2020	$ 654,229	$ 110	$ 679,235	$ 43	$ (25,159)