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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) income $ (29,979) $ 64,727 $ 390
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation 5,882 4,087 3,333
Amortization of intangible assets 1,034 1,678 2,137
Amortization of inventory fair value step-up 0 203 1,485
Amortization of deferred financing costs 137 176 151
Amortization of discount on notes receivable (190) (12) 0
Change in fair value of earn-out consideration 0 (3,560) (1,650)
Intangible asset impairment 0 590 0
Share-based compensation 14,768 21,195 17,732
Change in deferred income taxes 25,541 (26,670) (5,992)
Loss on divestiture of Stability 0 1,048 0
Increase (decrease) in cash, net of effects of acquisition and divestiture, resulting from changes in:      
Accounts receivable 0 (479) 73
Inventory (6,519) 2,747 (895)
Prepaid expenses (4,548) (305) (793)
Income tax receivable 202 (656) 0
Other assets 3,562 225 (1,567)
Accounts payable 6,585 (1,324) (3,478)
Accrued compensation 2,083 8,397 (2,586)
Accrued expenses 16,074 (3,534) 9,530
Income taxes 0 (5,611) 5,201
Other liabilities 1,164 17 778
Net cash flows provided by operating activities 35,796 62,939 23,849
Cash flows from investing activities:      
Purchases of property and equipment (9,419) (5,126) (6,205)
Proceeds from property and equipment sale 30 0 0
Principal payments from note receivable 778 0 0
Stability acquisition 0 0 (7,631)
Fixed maturity securities redemption 0 0 3,000
Patent application costs (609) (271) (842)
Net cash flows used in investing activities (9,220) (5,397) (11,678)
Cash flows from financing activities:      
Proceeds from exercise of stock options 3,555 11,987 3,494
Shares repurchased under repurchase plan (7,572) (68,263) (10,378)
Shares repurchased for tax withholdings on vesting of restricted stock (4,914) (4,082) (1,165)
Payments under capital lease obligations (3) (29) (102)
Net cash flows used in financing activities (8,934) (60,387) (8,151)
Net change in cash 17,642 (2,845) 4,020
Cash and cash equivalents, beginning of year 27,476 30,321 26,301
Cash and cash equivalents, end of year $ 45,118 $ 27,476 $ 30,321