CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 23,964	$ 45,511
Accounts receivable, net	50,474	46,430
Inventory, net	71,424	61,897
Prepaid expenses and other current assets	7,842	6,147
Total current assets	153,704	159,985
Property, plant and equipment, net	49,200	50,714
Surgical instruments, net	26,250	24,810
Goodwill	121,814	121,814
Intangible assets, net	18,899	22,758
Other assets	3,260	3,444
Total assets	373,127	383,525
Current liabilities:
Current maturities under capital lease obligation	1,122	973
Accounts payable	20,495	15,367
Accrued expenses	22,233	15,673
Accrued payroll liabilities	10,214	12,068
Total current liabilities	54,064	44,081
Convertible senior notes	39,176	36,894
Capital lease obligation, net of current maturities	33,812	34,933
Deferred income taxes, net	3,360	5,017
Other liabilities	316	1,032
Total liabilities	130,728	121,957
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.001 par value, 750,000,000 shares authorized; 43,389,576 and 42,291,352 shares issued and 43,373,611 and 42,282,741 shares outstanding, respectively	43	42
Additional paid-in capital	491,012	474,512
Accumulated deficit	(249,221)	(211,081)
Accumulated other comprehensive income (loss)	876	(1,771)
Treasury stock, at cost, 15,965 and 8,611 shares, respectively	(311)	(134)
Total stockholders’ equity	242,399	261,568
Total liabilities and stockholders’ equity	$ 373,127	$ 383,525