Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (25,939)	$ (61,195)	$ (23,226)
Adjustments to reconcile net loss to net cash provided by operating activities:
Change in allowance for doubtful accounts	3,426	85	310
Depreciation and amortization	49,684	45,681	42,803
Impairment loss – satellite network		31,224	10,680
Change in the fair values of acquisition-related contingent consideration	(8,035)	(1,002)	(360)
Amortization of the fair value adjustment related to StarTrak warranty liabilities			(57)
Amortization and write-off of deferred debt fees	776	3,106	835
Stock-based compensation	7,910	5,673	5,023
Foreign exchange loss (gain)	59	299	(106)
Deferred income taxes	(1,491)	(2,047)	256
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(14,040)	(10,025)	(1,702)
Inventories	8,277	(16,922)	(1,950)
Prepaid expenses and other assets	3,994	(10,474)	(4,574)
Accounts payable and accrued liabilities	(14,876)	12,168	4,893
Deferred revenue	2,708	(1,653)	(3,332)
Other liabilities	(999)	41	(567)
Net cash provided by (used in) operating activities	11,454	(5,041)	28,926
Cash flows from investing activities:
Acquisition of businesses, net of cash acquired		(67,911)	(3,452)
Capital expenditures	(22,198)	(27,360)	(28,424)
Change in restricted cash			1,000
Other	650	(650)	(198)
Net cash used in investing activities	(21,548)	(95,921)	(31,074)
Cash flows from financing activities:
Proceeds from issuance of common stock	27,967	15,000
Proceeds received from issuance of long-term debt		250,000
Payment under revolving credit facility	(14,000)
Proceeds from revolving credit facility	14,000
Cash paid for debt issuance costs		(5,359)
Proceeds received from employee stock purchase plan	1,194	1,001	345
Principal payment of long-term debt		(150,000)
Payment of deferred purchase consideration		(347)	(342)
Net cash provided by financing activities	29,161	110,295	3
Effect of exchange rate changes on cash and cash equivalents	(131)	474	91
Net increase (decrease) in cash and cash equivalents	18,936	9,807	(2,054)
Cash and cash equivalents:
Beginning of year	34,830	25,023	27,077
End of year	53,766	34,830	25,023
Cash paid for:
Interest	20,036	12,911	8,787
Income taxes	$ 5,532	$ 805	$ (94)