CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 87,388	$ 73,685
Restricted cash	1,865	1,865
Short-term investments	11,101	11,675
Restricted short-term investments	2,200	2,290
Accounts receivable, net	49,862	45,376
Inventories	104,726	110,501
Income tax refunds and deposits	682	311
Prepaid expenses and other assets	8,997	9,538
Total current assets	266,821	255,241
Property, plant, and equipment, net	238,236	233,856
Finance lease right-of-use assets	774	887
Operating lease right-of-use assets	17,086	18,805
Goodwill and intangible assets, net	40,271	41,153
Other assets	12,635	11,156
Deferred tax assets	24,235	25,873
Total assets	600,058	586,971
Current Liabilities:
Accounts payable and accrued liabilities	75,385	77,051
Income taxes payable	2,345	2,042
Current portion of long-term debt	12,075	7,741
Current portion of operating lease liabilities	3,481	3,175
Total current liabilities	93,286	90,009
Long-term reserve for income tax liabilities	3,425	3,425
Long-term debt, net of current portion	34,622	39,394
Long-term operating lease liabilities, net of current portion	14,530	16,315
Deferred tax liabilities	760	867
Other long-term liabilities	10,998	9,433
Total liabilities	157,621	159,443
Stockholders' equity:
Preferred stock: par value $0.0001; 20,000,000 shares authorized; no shares issued and outstanding
Common stock: par value $0.0001; 300,000,000 shares authorized; 54,372,275 and 47,494,909 shares issued and outstanding as of June 30, 2020 and 52,495,483 and 46,576,968 shares issued and outstanding as of December 31, 2019, respectively	5	5
Additional paid-in capital	396,841	367,305
Retained earnings	120,127	116,370
Accumulated other comprehensive loss	(5,173)	(4,687)
Treasury stock	(114,119)	(97,627)
Total Amphastar Pharmaceuticals, Inc. stockholders' equity	397,681	381,366
Non-controlling Interests	44,756	46,162
Total equity	442,437	427,528
Total liabilities and stockholders' equity	$ 600,058	$ 586,971